{"title":"Fuel Injection Conversion Kit","description":null,"products":[{"product_id":"sniper-efi-self-tuning-master-kit-550-849k","title":"Holley Sniper EFI 2300 Self-Tuning Master Kit, Up to 350 HP, Complete Fuel System | 550-849K","description":"\u003cp\u003eHolley's Sniper EFI 2300 brings self-tuning fuel injection within reach for vehicles that came factory with a 2300-flange 2-barrel carburetor, including many classic Fords, AMCs, and Mustangs, and adapts to square-flange or Q-jet 4-barrel intakes with a Mr. Gasket adapter (P\/N 1933 or 1929MRG). The Master Kit pairs the throttle-body EFI unit with a complete fuel system, putting an end to cold-start issues, hesitation, vapor lock, and flooding in one bolt-on package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBolt-on 2300-flange carburetor replacement\u003c\/li\u003e\n\u003cli\u003eSupports up to 350 HP naturally aspirated or 285 HP forced induction with (2) 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eOnly 4 wiring connections required for installation\u003c\/li\u003e\n\u003cli\u003eInternal fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eHigh-resolution 3.5\" full-color touchscreen display\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard — no laptop required\u003c\/li\u003e\n\u003cli\u003eSelf-tuning ECU learns and adjusts without prior tuning experience\u003c\/li\u003e\n\u003cli\u003eIncludes clamp-on O2 sensor kit (Bosch wideband)\u003c\/li\u003e\n\u003cli\u003eIncludes 20 ft of 3\/8\" Earl's Vapor Guard fuel hose\u003c\/li\u003e\n\u003cli\u003eIncludes fuel pump, pre- and post-fuel filters, and return bulkhead fitting\u003c\/li\u003e\n\u003cli\u003eAll necessary hardware for a complete fuel system conversion included\u003c\/li\u003e\n\u003cli\u003eFree downloadable Sniper tuning software\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Throttle-body mounted, self-tuning EFI conversion, Master Kit\u003c\/li\u003e\n\u003cli\u003eFlange: 2300 (2-barrel), adapts to square-flange\/Q-jet 4bbl with separate adapter\u003c\/li\u003e\n\u003cli\u003eMax Support: 350 HP N\/A, 285 HP forced induction\u003c\/li\u003e\n\u003cli\u003eWiring: 4-wire vehicle connection\u003c\/li\u003e\n\u003cli\u003eDisplay: 3.5\" full-color touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: Handheld\/onboard monitor, 20 ft EFI fuel hose, fuel pump, pre\/post fuel filters, return bulkhead, O2 sensor kit, hardware\u003c\/li\u003e\n\u003cli\u003eFinish: Shiny\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-849K\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for at-home installation with Holley's installation manuals and online videos; recommended companion upgrades include HyperSpark ignition, air cleaners, and digital dashes for a fuller EFI conversion.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat vehicles is the Sniper EFI 2300 Master Kit designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for engines that came factory with a Holley 2300 (2-barrel) flange, including many classic Fairlanes, Galaxies, Falcons, Comets, F-100s, Javelins, Rebels, Mustangs, Thunderbirds, and Cougars. It can also adapt to a square-flange or Q-jet spread-bore 4-barrel intake using a separate Mr. Gasket adapter.\u003c\/p\u003e\u003ch5\u003eWhat's included in the Master Kit that isn't in the base kit?\u003c\/h5\u003e\u003cp\u003eThe Master Kit adds a complete fuel system: 20 ft of EFI-rated fuel hose, a high-pressure fuel pump, pre- and post-fuel filters, a return bulkhead fitting, and the hardware needed for a full fuel system conversion.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can this kit support?\u003c\/h5\u003e\u003cp\u003eUp to 350 HP naturally aspirated or 285 HP with forced induction, using the included (2) 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to tune it?\u003c\/h5\u003e\u003cp\u003eNo. The kit uses a simple calibration wizard on the touchscreen and self-tunes based on answers to a few engine questions — no laptop or prior tuning experience required.\u003c\/p\u003e\u003ch5\u003eWhat's the difference between this and the base Sniper EFI 550-849 kit?\u003c\/h5\u003e\u003cp\u003eThe 550-849K Master Kit includes the complete fuel system (hose, pump, filters, return bulkhead, hardware); the base 550-849 kit is the throttle-body EFI unit and handheld tuner without the fuel system components.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What vehicles is the Sniper EFI 2300 Master Kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for engines that came factory with a Holley 2300 (2-barrel) flange, including many classic Fairlanes, Galaxies, Falcons, Comets, F-100s, Javelins, Rebels, Mustangs, Thunderbirds, and Cougars. It can also adapt to a square-flange or Q-jet spread-bore 4-barrel intake using a separate Mr. Gasket adapter.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the Master Kit that isn't in the base kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Master Kit adds a complete fuel system: 20 ft of EFI-rated fuel hose, a high-pressure fuel pump, pre- and post-fuel filters, a return bulkhead fitting, and the hardware needed for a full fuel system conversion.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can this kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 350 HP naturally aspirated or 285 HP with forced induction, using the included (2) 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to tune it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The kit uses a simple calibration wizard on the touchscreen and self-tunes based on answers to a few engine questions — no laptop or prior tuning experience required.\"}},{\"@type\":\"Question\",\"name\":\"What's the difference between this and the base Sniper EFI 550-849 kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 550-849K Master Kit includes the complete fuel system (hose, pump, filters, return bulkhead, hardware); the base 550-849 kit is the throttle-body EFI unit and handheld tuner without the fuel system components.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418560335920,"sku":"GVMR_550-849K","price":1477.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-849k-revise18269.jpg?v=1758383707"},{"product_id":"sniper-efi-self-tuning-kit-550-849","title":"Holley Sniper EFI 2300 Self-Tuning Kit, Up to 350 HP, Handheld Tuner | 550-849","description":"\u003cp\u003eHolley's Sniper EFI 2300 brings self-tuning fuel injection within reach for vehicles that came factory with a 2300-flange 2-barrel carburetor, and it's a direct bolt-on replacement for popular classic Holley carburetors like the 0-4412 and 0-7448. It also adapts to a square-flange or Q-jet 4-barrel intake with a Mr. Gasket adapter (P\/N 1933 or 1929MRG), putting an end to cold-start issues, hesitation, vapor lock, and flooding.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBolt-on 2300-flange carburetor replacement\u003c\/li\u003e\n\u003cli\u003eDirect replacement for classic Holley 0-4412 and 0-7448 carburetors\u003c\/li\u003e\n\u003cli\u003eSupports up to 350 HP naturally aspirated or 285 HP forced induction with (2) 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eThrottle-body mounted ECU — no separate control box to mount\u003c\/li\u003e\n\u003cli\u003eOnly 4 wiring connections required\u003c\/li\u003e\n\u003cli\u003eInternal fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eHigh-resolution 3.5\" full-color touchscreen display\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard — no laptop required\u003c\/li\u003e\n\u003cli\u003eIncludes clamp-on O2 sensor kit\u003c\/li\u003e\n\u003cli\u003eIncludes handheld tuner\u003c\/li\u003e\n\u003cli\u003eFree downloadable Sniper tuning software\u003c\/li\u003e\n\u003cli\u003ePrintable throttle body flange template included\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Throttle-body mounted, self-tuning EFI conversion kit\u003c\/li\u003e\n\u003cli\u003eFlange: 2300 (2-barrel), adapts to square-flange\/Q-jet 4bbl with separate adapter\u003c\/li\u003e\n\u003cli\u003eMax Support: 350 HP N\/A, 285 HP forced induction\u003c\/li\u003e\n\u003cli\u003eWiring: 4-wire vehicle connection\u003c\/li\u003e\n\u003cli\u003eDisplay: 3.5\" full-color touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: Handheld tuner, clamp-on O2 sensor kit\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-849\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFuel system components (pump, hose, filters) are sold separately or bundled in the 550-849K Master Kit; can also be installed on marine applications per Holley's Tech Resources guidance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this kit include a fuel pump and hose?\u003c\/h5\u003e\u003cp\u003eNo, the base 550-849 kit is the throttle-body EFI unit, ECU, and handheld tuner. For a complete fuel system (pump, hose, filters, return bulkhead), see the 550-849K Master Kit.\u003c\/p\u003e\u003ch5\u003eWhat carburetors does this replace?\u003c\/h5\u003e\u003cp\u003eIt's a direct bolt-on replacement for classic Holley 2300-flange carburetors such as the 0-4412 and 0-7448.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can it support?\u003c\/h5\u003e\u003cp\u003eUp to 350 HP naturally aspirated or 285 HP with forced induction using the included (2) 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDo I need tuning experience to run this?\u003c\/h5\u003e\u003cp\u003eNo. A simple calibration wizard on the touchscreen walks through a few engine questions and the ECU self-tunes from there.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this kit include a fuel pump and hose?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the base 550-849 kit is the throttle-body EFI unit, ECU, and handheld tuner. For a complete fuel system (pump, hose, filters, return bulkhead), see the 550-849K Master Kit.\"}},{\"@type\":\"Question\",\"name\":\"What carburetors does this replace?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a direct bolt-on replacement for classic Holley 2300-flange carburetors such as the 0-4412 and 0-7448.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 350 HP naturally aspirated or 285 HP with forced induction using the included (2) 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need tuning experience to run this?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. A simple calibration wizard on the touchscreen walks through a few engine questions and the ECU self-tunes from there.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418560401456,"sku":"GVMR_550-849","price":1129.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-849k18145.jpg?v=1758383715"},{"product_id":"sniper-efi-self-tuning-master-kit-550-858k","title":"Holley Sniper EFI BBD Self-Tuning Master Kit, Jeep CJ 258ci, Complete Fuel System | 550-858K","description":"\u003cp\u003eThe Sniper EFI BBD Master Kit is a self-tuning EFI conversion built specifically for 258ci-powered Jeep CJs, replacing the factory BBD carburetor with throttle-body fuel injection and adding integrated ignition timing control. It's suited to trail rigs and weekend cruisers alike, putting an end to cold-start issues, hesitation, vapor lock, and flooding while improving throttle response and wide-open-throttle power over the carburetor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eThrottle-body mounted ECU — no extra boxes to mount\u003c\/li\u003e\n\u003cli\u003eSupports up to 350 HP with two 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eOnly 4 wiring connections required\u003c\/li\u003e\n\u003cli\u003eInternal fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition timing control\u003c\/li\u003e\n\u003cli\u003eFull-color touchscreen for setup, tuning, and gauge displays\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard — no laptop required\u003c\/li\u003e\n\u003cli\u003eSelf-tuning ECU means no computer expertise needed\u003c\/li\u003e\n\u003cli\u003eIncludes Bosch LSU 4.9 wideband oxygen sensor\u003c\/li\u003e\n\u003cli\u003eOEM-style TPS, IAC, and fuel pressure regulator for long service life\u003c\/li\u003e\n\u003cli\u003eO2 sensor kit sized for 2.25\" exhaust for a leak-free install\u003c\/li\u003e\n\u003cli\u003eIncludes 20 ft of 3\/8\" Vapor Guard fuel hose, fuel pump, filters, and hardware to return fuel to the tank\u003c\/li\u003e\n\u003cli\u003eStainless steel T-bolt clamps and a stainless weldable flange included\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: Throttle-body mounted, self-tuning EFI conversion, Master Kit\u003c\/li\u003e\n\u003cli\u003eApplication: 258ci Jeep CJ, BBD carburetor replacement\u003c\/li\u003e\n\u003cli\u003eMax Support: 350 HP with (2) 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eWiring: 4-wire vehicle connection\u003c\/li\u003e\n\u003cli\u003eDisplay: 3.5\" full-color touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: Handheld\/onboard monitor, 20 ft EFI fuel hose, fuel pump, filters, return bulkhead, wideband O2 sensor kit, hardware\u003c\/li\u003e\n\u003cli\u003eFinish: Shiny\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-858K\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePart of Holley's broader Sniper EFI ecosystem — pairs with HyperSpark ignition components, air cleaners, and digital dashes for a fuller conversion.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat vehicles is this kit designed for?\u003c\/h5\u003e\u003cp\u003eIt's built specifically for 258ci-powered Jeep CJs running a factory BBD carburetor.\u003c\/p\u003e\u003ch5\u003eDoes this kit include ignition timing control?\u003c\/h5\u003e\u003cp\u003eYes, unlike the standard Sniper 2300 kits, the BBD Master Kit includes integrated ignition timing control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the fuel system?\u003c\/h5\u003e\u003cp\u003e20 ft of 3\/8\" Vapor Guard fuel hose, a high-pressure fuel pump, pre- and post-fuel filters, a return bulkhead, stainless T-bolt clamps, and a stainless weldable flange.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can it support?\u003c\/h5\u003e\u003cp\u003eUp to 350 HP with the included (2) 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eWhat oxygen sensor is included?\u003c\/h5\u003e\u003cp\u003eA Bosch LSU 4.9 wideband oxygen sensor with a leak-free O2 sensor kit sized for 2.25\" exhaust.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What vehicles is this kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built specifically for 258ci-powered Jeep CJs running a factory BBD carburetor.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include ignition timing control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, unlike the standard Sniper 2300 kits, the BBD Master Kit includes integrated ignition timing control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the fuel system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"20 ft of 3\/8 inch Vapor Guard fuel hose, a high-pressure fuel pump, pre- and post-fuel filters, a return bulkhead, stainless T-bolt clamps, and a stainless weldable flange.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 350 HP with the included (2) 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"What oxygen sensor is included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A Bosch LSU 4.9 wideband oxygen sensor with a leak-free O2 sensor kit sized for 2.25 inch exhaust.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418560466992,"sku":"GVMR_550-858K","price":1604.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-858k18277.jpg?v=1758383723"},{"product_id":"sniper-efi-self-tuning-master-kit-550-850k","title":"Holley Sniper EFI Self-Tuning Master Kit, 2300 Flange, Up to 350 HP | 550-850K","description":"\u003cp\u003eThe Sniper EFI Self-Tuning Master Kit brings self-tuning electronic fuel injection to any vehicle that came standard with a 2300 Holley flange, such as many Fairlanes, Galaxies, Falcons, Comets, F-100s, Javelins, Rebels, Mustangs, Thunderbirds, and Cougars. It's priced to make the switch from carburetor to EFI affordable, putting an end to cold-start issues, hesitation, vapor lock, and flooding.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBolt-on 2300-flange carburetor replacement\u003c\/li\u003e\n\u003cli\u003eSupports up to 350 horsepower\u003c\/li\u003e\n\u003cli\u003eOnly 4 wiring connections required for installation\u003c\/li\u003e\n\u003cli\u003eInternal fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eHigh-resolution full-color touchscreen handheld monitor\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard — no laptop required\u003c\/li\u003e\n\u003cli\u003eIncludes clamp-on O2 sensor kit\u003c\/li\u003e\n\u003cli\u003eSniper tuning software is free to download\u003c\/li\u003e\n\u003cli\u003ePrintable throttle body flange template included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThrottle Body Flange: 2300 Holley (adapts to a square-bore 4150 flange with Mr. Gasket adapter 1933, or a spread-bore Q-jet flange with Mr. Gasket adapter 1929MRG)\u003c\/li\u003e\n\u003cli\u003eFinish: Black ceramic\u003c\/li\u003e\n\u003cli\u003eKit Includes: Throttle body, handheld touchscreen monitor, EFI hose, fuel pump, pre- and post-fuel filters, return bulkhead fitting, and installation hardware\u003c\/li\u003e\n\u003cli\u003eMax Support: 350 hp\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-850K\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDesigned for vehicles that came factory-equipped with a 2300 Holley carburetor flange; a Mr. Gasket adapter is needed to mount on square-bore or spread-bore intakes.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch5\u003eWhat vehicles is this kit designed for?\u003c\/h5\u003e\n\u003cp\u003eIt's built for any vehicle that came standard with a 2300 Holley carburetor flange, including many Fairlanes, Galaxies, Falcons, Comets, F-100s, Javelins, Rebels, Mustangs, Thunderbirds, and Cougars.\u003c\/p\u003e\n\u003ch5\u003eCan I install this kit on a 4150 square-bore or Q-jet spread-bore intake?\u003c\/h5\u003e\n\u003cp\u003eYes, with a Mr. Gasket adapter — part number 1933 for a 4150 square flange or 1929MRG for a spread-bore application.\u003c\/p\u003e\n\u003ch5\u003eIs a laptop required to tune this system?\u003c\/h5\u003e\n\u003cp\u003eNo. The kit includes a high-resolution touchscreen handheld monitor with a simple calibration wizard, so no laptop is needed to get running. Sniper tuning software is also free to download for further adjustments.\u003c\/p\u003e\n\u003ch5\u003eHow much horsepower does this kit support?\u003c\/h5\u003e\n\u003cp\u003eThe Sniper EFI Self-Tuning Master Kit supports engines up to 350 horsepower.\u003c\/p\u003e\n\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\n\u003cp\u003eThe kit includes the 2300-flange throttle body\/ECU unit, a handheld touchscreen monitor, EFI hose, fuel pump, pre- and post-fuel filters, a return bulkhead fitting, a clamp-on O2 sensor kit, and installation hardware.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What vehicles is this kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for any vehicle that came standard with a 2300 Holley carburetor flange, including many Fairlanes, Galaxies, Falcons, Comets, F-100s, Javelins, Rebels, Mustangs, Thunderbirds, and Cougars.\"}},{\"@type\":\"Question\",\"name\":\"Can I install this kit on a 4150 square-bore or Q-jet spread-bore intake?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, with a Mr. Gasket adapter — part number 1933 for a 4150 square flange or 1929MRG for a spread-bore application.\"}},{\"@type\":\"Question\",\"name\":\"Is a laptop required to tune this system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The kit includes a high-resolution touchscreen handheld monitor with a simple calibration wizard, so no laptop is needed to get running. Sniper tuning software is also free to download for further adjustments.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Sniper EFI Self-Tuning Master Kit supports engines up to 350 horsepower.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit includes the 2300-flange throttle body\/ECU unit, a handheld touchscreen monitor, EFI hose, fuel pump, pre- and post-fuel filters, a return bulkhead fitting, a clamp-on O2 sensor kit, and installation hardware.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418562957360,"sku":"GVMR_550-850K","price":1541.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-850k-revise18269.jpg?v=1758383985"},{"product_id":"sniper-efi-self-tuning-kit-550-850","title":"Holley Sniper EFI 2300 Self-Tuning Kit, Up to 350 HP, Touchscreen | 550-850","description":"\u003cp\u003eSniper EFI 2300 brings self-tuning electronic fuel injection within reach for vehicles that came standard with a 2300 Holley flange, from Fairlanes and Galaxies to Mustangs, Cougars, and F100s. It's an economical way to add EFI while curing cold-start issues, hesitation, vapor lock, and flooding.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBolt-on replacement for 2300-flange Holley carburetors (e.g., 0-4412, 0-7448)\u003c\/li\u003e\n\u003cli\u003eSupports up to 350 HP naturally aspirated or 285 HP forced induction with (2) 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eThrottle-body-mounted ECU\u003c\/li\u003e\n\u003cli\u003eJust 4 wire vehicle connections: battery, switched ignition, RPM\u003c\/li\u003e\n\u003cli\u003eInternal fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eHigh-resolution full-color 3.5\" touchscreen display\u003c\/li\u003e\n\u003cli\u003eSimple calibration wizard, no laptop required\u003c\/li\u003e\n\u003cli\u003eIncludes clamp-on O2 sensor kit\u003c\/li\u003e\n\u003cli\u003eAdapts to square-flange or Q-jet-flange 4bbl intakes with a Mr. Gasket adapter (1933 for 4150 square flange, 1929MRG for spread bore)\u003c\/li\u003e\n\u003cli\u003eDesigned for at-home garage installation with Holley's install manuals and videos\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange: 2300 (Holley)\u003c\/li\u003e\n\u003cli\u003eMax Power: 350 HP naturally aspirated \/ 285 HP forced induction\u003c\/li\u003e\n\u003cli\u003eInjectors: (2) 100 lb\/hr, included\u003c\/li\u003e\n\u003cli\u003eWiring: 4-wire connection\u003c\/li\u003e\n\u003cli\u003eDisplay: 3.5\" touchscreen handheld\u003c\/li\u003e\n\u003cli\u003eO2 Sensor: Clamp-on kit included\u003c\/li\u003e\n\u003cli\u003eVehicle Fit: Classic Fords with 2300 flange (Fairlane, Galaxie, Falcon, Comet, F100, Javelin, Rebel, Mustang, Thunderbird, Cougar, and more)\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-850\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCan also adapt to a square-flange or Q-jet spread-bore 4bbl intake using a Mr. Gasket adapter (P\/N 1933 or 1929MRG).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat carburetor flange does the Sniper EFI 2300 replace?\u003c\/h5\u003e\u003cp\u003eIt's a bolt-on replacement for popular classic Holley 2300-flange carburetors like the 0-4412 and 0-7448.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can it support?\u003c\/h5\u003e\u003cp\u003eUp to 350 HP naturally aspirated or 285 HP with forced induction, using the included (2) 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes it require a laptop to tune?\u003c\/h5\u003e\u003cp\u003eNo, the 3.5-inch touchscreen handheld has a simple calibration wizard — no laptop needed.\u003c\/p\u003e\u003ch5\u003eCan it be adapted to a square-flange or spread-bore intake?\u003c\/h5\u003e\u003cp\u003eYes, with a Mr. Gasket adapter — part 1933 for 4150 square flange or 1929MRG for spread bore.\u003c\/p\u003e\u003ch5\u003eWhat's included with the kit?\u003c\/h5\u003e\u003cp\u003eThe throttle-body-mounted ECU, internal fuel pressure regulator, touchscreen handheld, and a clamp-on oxygen sensor kit.\u003c\/p\u003e\u003ch5\u003eHow many wiring connections does it need?\u003c\/h5\u003e\u003cp\u003eJust 4 — battery, switched ignition, and RPM signal.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What carburetor flange does the Sniper EFI 2300 replace?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a bolt-on replacement for popular classic Holley 2300-flange carburetors like the 0-4412 and 0-7448.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 350 HP naturally aspirated or 285 HP with forced induction, using the included (2) 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it require a laptop to tune?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the 3.5-inch touchscreen handheld has a simple calibration wizard — no laptop needed.\"}},{\"@type\":\"Question\",\"name\":\"Can it be adapted to a square-flange or spread-bore intake?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, with a Mr. Gasket adapter — part 1933 for 4150 square flange or 1929MRG for spread bore.\"}},{\"@type\":\"Question\",\"name\":\"What's included with the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The throttle-body-mounted ECU, internal fuel pressure regulator, touchscreen handheld, and a clamp-on oxygen sensor kit.\"}},{\"@type\":\"Question\",\"name\":\"How many wiring connections does it need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Just 4 — battery, switched ignition, and RPM signal.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418567512112,"sku":"GVMR_550-850","price":1193.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-850k18145.jpg?v=1758384131"},{"product_id":"hp-efi-ecu-harness-kits-550-602n","title":"Holley HP EFI ECU \u0026 Harness Kit, GM LS1\/LS6 24x, NTK Oxygen Sensor | 550-602N","description":"\u003cp\u003eThe Holley HP EFI ECU and harness kit gives GM LS1\/LS6 owners a plug-and-play way to control fuel and ignition, with room to grow into boost, nitrous, or water\/meth control as the build evolves. Download a base map for a stock LS engine and drive, or dial in a turbocharged, nitrous-fed combination running on water\/meth — the same ECU handles both without constant re-flashing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eECU certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eLaptop-programmable with a variety of included base maps\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eNTK oxygen sensor recommended for leaded or methanol fuels, high exhaust temperatures, and forced induction applications\u003c\/li\u003e\n\u003cli\u003eECU is fully potted for engine bay or interior mounting\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel strategy reduces time spent tuning\u003c\/li\u003e\n\u003cli\u003eMore functionality than OEM or competing ECUs — boost control, nitrous control, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eSimple plug-and-play installation into factory sensors, power, and grounds\u003c\/li\u003e\n\u003cli\u003eOptional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges available\u003c\/li\u003e\n\u003cli\u003eKit includes ECU, harness, communication cable, software, and NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for boost control, progressive nitrous, water\/meth injection, and more\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS1\/LS6\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-602N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-602N fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM LS1\/LS6 engines with a 24x crank sensor and Jetronic\/Minitimer (Bosch-type) injector connectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to use this ECU?\u003c\/h5\u003e\u003cp\u003eThe ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges are also available.\u003c\/p\u003e\u003ch5\u003eCan this ECU control more than fuel and ignition?\u003c\/h5\u003e\u003cp\u003eYes. It has 4 programmable inputs and 4 programmable outputs that can support boost control, progressive nitrous, water\/meth injection, fan control, and more.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe kit includes the ECU, harness, communication cable, software, and an NTK wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eWhat if I need more inputs and outputs than this kit offers?\u003c\/h5\u003e\u003cp\u003eHolley recommends the Dominator VMS if your combination of controls requires more than the 4 inputs and 4 outputs on this HP EFI kit.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-602N fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM LS1\/LS6 engines with a 24x crank sensor and Jetronic\/Minitimer (Bosch-type) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to use this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7 inch touchscreen, and digital gauges are also available.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU control more than fuel and ignition?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It has 4 programmable inputs and 4 programmable outputs that can support boost control, progressive nitrous, water\/meth injection, fan control, and more.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit includes the ECU, harness, communication cable, software, and an NTK wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"What if I need more inputs and outputs than this kit offers?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley recommends the Dominator VMS if your combination of controls requires more than the 4 inputs and 4 outputs on this HP EFI kit.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418599690288,"sku":"GVMR_550-602N","price":3099.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-602n.jpg?v=1758386804"},{"product_id":"hp-efi-ecu-harness-kits-550-602","title":"Holley HP EFI ECU \u0026 Harness Kit, GM LS1\/LS6 24x, Bosch Oxygen Sensor | 550-602","description":"\u003cp\u003eThe Holley HP EFI ECU and harness kit gives GM LS1\/LS6 owners a plug-and-play way to control fuel and ignition, with room to grow into boost, nitrous, or water\/meth control as the build evolves. Download a base map for a stock LS engine and drive, or dial in a turbocharged, nitrous-fed combination running on water\/meth — the same ECU handles both without constant re-flashing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eECU certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eLaptop-programmable with a variety of included base maps\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eECU is fully potted for engine bay or interior mounting\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel strategy reduces time spent tuning\u003c\/li\u003e\n\u003cli\u003eMore functionality than OEM or competing ECUs — boost control, nitrous control, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eSimple plug-and-play installation into factory sensors, power, and grounds\u003c\/li\u003e\n\u003cli\u003eOptional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges available\u003c\/li\u003e\n\u003cli\u003eKit includes ECU, harness, communication cable, software, and Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for boost control, progressive nitrous, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS1\/LS6\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-602\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-602 fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM LS1\/LS6 engines with a 24x crank sensor and Jetronic\/Minitimer (Bosch-type) injector connectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to use this ECU?\u003c\/h5\u003e\u003cp\u003eThe ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges are also available.\u003c\/p\u003e\u003ch5\u003eCan this ECU control more than fuel and ignition?\u003c\/h5\u003e\u003cp\u003eYes. It has 4 programmable inputs and 4 programmable outputs that can support boost control, progressive nitrous, water\/meth injection, fan control, and more.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe kit includes the ECU, harness, communication cable, software, and a Bosch wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eAre software updates available?\u003c\/h5\u003e\u003cp\u003eYes, software and firmware updates can be downloaded free of charge.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-602 fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM LS1\/LS6 engines with a 24x crank sensor and Jetronic\/Minitimer (Bosch-type) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to use this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7 inch touchscreen, and digital gauges are also available.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU control more than fuel and ignition?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It has 4 programmable inputs and 4 programmable outputs that can support boost control, progressive nitrous, water\/meth injection, fan control, and more.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The kit includes the ECU, harness, communication cable, software, and a Bosch wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Are software updates available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, software and firmware updates can be downloaded free of charge.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418599755824,"sku":"GVMR_550-602","price":2849.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-602.jpg?v=1758386812"},{"product_id":"gm-tpi-and-holley-stealth-ram™-includes-ntk-oxygen-sensor-550-601n","title":"Holley HP EFI ECU \u0026 Harness Kit, GM TPI\/Stealth Ram, NTK Oxygen Sensor | 550-601N","description":"\u003cp\u003eLooking for a plug-and-play alternative for a stock or built late-model factory EFI engine, or a replacement for an older Holley C950 ECU? This HP EFI ECU and harness kit is designed to replace the factory ECU and harness on GM TPI and Holley Stealth Ram applications, adding accurate fuel and ignition control plus optional nitrous, boost, or water\/meth control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInternal data logger with scalable axes, smoothing, and multiple graph views\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eAdvanced idle, closed-loop, and enrichment strategies for stable operation\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, works with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control sensor inputs for one or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003ePlug-and-play control of factory GM 24x and 58x LSx engines\u003c\/li\u003e\n\u003cli\u003eProgressive nitrous control based on time, RPM, or boost (requires part number 554-111)\u003c\/li\u003e\n\u003cli\u003eFull timing retard\/control configurability per stage, based on RPM or time\u003c\/li\u003e\n\u003cli\u003eDedicated fuel and oil pressure inputs\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data logging, or gauge display\u003c\/li\u003e\n\u003cli\u003eInternal data logging with 2GB of memory\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003eEight-channel Distributorless Ignition (DIS) outputs, compatible with Smart ignition coils or Holley DIS coils\u003c\/li\u003e\n\u003cli\u003eSpeed density, Alpha-N, or combination fueling strategies\u003c\/li\u003e\n\u003cli\u003eTurbo boost control and integrated water\/methanol injection control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: GM TPI and Holley Stealth Ram™\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil (no timing control), GM HEI small cap, or Holley Dual Sync distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-601N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS. Free software and firmware updates are available for download.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat applications is the 550-601N designed for?\u003c\/h5\u003e\u003cp\u003eIt's built as a plug-and-play replacement for GM TPI and Holley Stealth Ram™ factory EFI systems, or as a replacement for an older Holley C950 ECU.\u003c\/p\u003e\u003ch5\u003eDoes it support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It offers turbo boost control and progressive nitrous control (nitrous requires part number 554-111), along with integrated water\/methanol injection control.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, GM HEI small cap, and Holley Dual Sync distributor ignition types.\u003c\/p\u003e\u003ch5\u003eCan I data-log with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it includes internal data logging with 2GB of memory and an optional 5.7\" full-color touchscreen for real-time viewing.\u003c\/p\u003e\u003ch5\u003eWhat oxygen sensor does this kit include?\u003c\/h5\u003e\u003cp\u003eIt includes an NTK wideband oxygen sensor, recommended for leaded or methanol fuels and high exhaust temperature applications.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What applications is the 550-601N designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built as a plug-and-play replacement for GM TPI and Holley Stealth Ram factory EFI systems, or as a replacement for an older Holley C950 ECU.\"}},{\"@type\":\"Question\",\"name\":\"Does it support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It offers turbo boost control and progressive nitrous control, nitrous requires part number 554-111, along with integrated water\/methanol injection control.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, GM HEI small cap, and Holley Dual Sync distributor ignition types.\"}},{\"@type\":\"Question\",\"name\":\"Can I data-log with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes internal data logging with 2GB of memory and an optional 5.7 inch full-color touchscreen for real-time viewing.\"}},{\"@type\":\"Question\",\"name\":\"What oxygen sensor does this kit include?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It includes an NTK wideband oxygen sensor, recommended for leaded or methanol fuels and high exhaust temperature applications.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418599821360,"sku":"GVMR_550-601N","price":2548.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-601N_02_fcb4d8e6-402f-46d3-9514-5fdca0c9bda7.jpg?v=1758386820"},{"product_id":"gm-tpi-and-holley-stealth-ram™-includes-bosch-oxygen-sensor-550-601","title":"Holley HP EFI ECU \u0026 Harness Kit, GM TPI\/Stealth Ram, Bosch Oxygen Sensor | 550-601","description":"\u003cp\u003eLooking for a plug-and-play alternative for a stock or built late-model factory EFI engine, or a replacement for an older Holley C950 ECU? This HP EFI ECU and harness kit is designed to replace the factory ECU and harness on GM TPI and Holley Stealth Ram applications, adding accurate fuel and ignition control plus optional nitrous, boost, or water\/meth control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInternal data logger with scalable axes, smoothing, and multiple graph views\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eAdvanced idle, closed-loop, and enrichment strategies for stable operation\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, works with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control sensor inputs for one or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003ePlug-and-play control of factory GM 24x and 58x LSx engines\u003c\/li\u003e\n\u003cli\u003eProgressive nitrous control based on time, RPM, or boost (requires part number 554-111)\u003c\/li\u003e\n\u003cli\u003eFull timing retard\/control configurability per stage, based on RPM or time\u003c\/li\u003e\n\u003cli\u003eDedicated fuel and oil pressure inputs\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data logging, or gauge display\u003c\/li\u003e\n\u003cli\u003eInternal data logging with 2GB of memory\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003eEight-channel Distributorless Ignition (DIS) outputs, compatible with Smart ignition coils or Holley DIS coils\u003c\/li\u003e\n\u003cli\u003eSpeed density, Alpha-N, or combination fueling strategies\u003c\/li\u003e\n\u003cli\u003eTurbo boost control and integrated water\/methanol injection control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: GM TPI and Holley Stealth Ram™\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil (no timing control), GM HEI small cap, or Holley Dual Sync distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-601\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS. Free software and firmware updates are available for download.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat applications is the 550-601 designed for?\u003c\/h5\u003e\u003cp\u003eIt's built as a plug-and-play replacement for GM TPI and Holley Stealth Ram™ factory EFI systems, or as a replacement for an older Holley C950 ECU.\u003c\/p\u003e\u003ch5\u003eDoes it support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It offers turbo boost control and progressive nitrous control (nitrous requires part number 554-111), along with integrated water\/methanol injection control.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, GM HEI small cap, and Holley Dual Sync distributor ignition types.\u003c\/p\u003e\u003ch5\u003eCan I data-log with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it includes internal data logging with 2GB of memory and an optional 5.7\" full-color touchscreen for real-time viewing.\u003c\/p\u003e\u003ch5\u003eWhat oxygen sensor does this kit include?\u003c\/h5\u003e\u003cp\u003eIt includes a Bosch wideband oxygen sensor.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What applications is the 550-601 designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built as a plug-and-play replacement for GM TPI and Holley Stealth Ram factory EFI systems, or as a replacement for an older Holley C950 ECU.\"}},{\"@type\":\"Question\",\"name\":\"Does it support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It offers turbo boost control and progressive nitrous control, nitrous requires part number 554-111, along with integrated water\/methanol injection control.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, GM HEI small cap, and Holley Dual Sync distributor ignition types.\"}},{\"@type\":\"Question\",\"name\":\"Can I data-log with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes internal data logging with 2GB of memory and an optional 5.7 inch full-color touchscreen for real-time viewing.\"}},{\"@type\":\"Question\",\"name\":\"What oxygen sensor does this kit include?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It includes a Bosch wideband oxygen sensor.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418599886896,"sku":"GVMR_550-601","price":2749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-601.jpg?v=1758386827"},{"product_id":"hp-efi-ecu-harness-kits-550-603n","title":"Holley HP EFI ECU \u0026 Harness Kit, GM LS2\/3\/7 58x USCAR, NTK Oxygen Sensor | 550-603N","description":"\u003cp\u003eThe Holley HP EFI ECU and harness kit gives GM LS2\/LS3\/LS7 owners a plug-and-play way to control fuel and ignition, with room to grow into boost, nitrous, or water\/meth control as the build evolves. Download a base map for a stock LS engine and drive, or dial in a turbocharged, nitrous-fed combination running on water\/meth — the same ECU handles both without constant re-flashing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eECU certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eLaptop-programmable with a variety of included base maps\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eNTK oxygen sensor recommended for leaded or methanol fuels, high exhaust temperatures, and forced induction\u003c\/li\u003e\n\u003cli\u003eECU is fully potted for engine bay or interior mounting\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel strategy reduces time spent tuning\u003c\/li\u003e\n\u003cli\u003eMore functionality than OEM or competing ECUs — boost control, nitrous control, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eSimple plug-and-play installation into factory sensors, power, and grounds\u003c\/li\u003e\n\u003cli\u003eOptional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges available\u003c\/li\u003e\n\u003cli\u003eKit includes ECU, harness, communication cable, software, USCAR (EV6 style) injector connectors, and NTK wideband O2 sensor\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS2\/LS3\/LS7\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6 style)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, USCAR injector connectors, NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-603N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for GM LS2\/LS3\/LS7 engines with factory GM coils and a 58-tooth crank sensor. If more than 4 inputs and 4 outputs are needed, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-603N fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and USCAR (EV6 style) injector connectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to use this ECU?\u003c\/h5\u003e\u003cp\u003eThe ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges are also available.\u003c\/p\u003e\u003ch5\u003eWhat injector connectors does this kit use?\u003c\/h5\u003e\u003cp\u003eUSCAR (EV6 style) connectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe ECU, harness, communication cable, software, USCAR injector connectors, and an NTK wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eCan this ECU control boost and nitrous?\u003c\/h5\u003e\u003cp\u003eYes. It has 4 programmable inputs and 4 programmable outputs that support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-603N fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and USCAR (EV6 style) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to use this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7 inch touchscreen, and digital gauges are also available.\"}},{\"@type\":\"Question\",\"name\":\"What injector connectors does this kit use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"USCAR (EV6 style) connectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU, harness, communication cable, software, USCAR injector connectors, and an NTK wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU control boost and nitrous?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It has 4 programmable inputs and 4 programmable outputs that support boost control, progressive nitrous, water\/meth injection, and more.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600214576,"sku":"GVMR_550-603N","price":2633.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-603n.jpg?v=1758386864"},{"product_id":"hp-efi-ecu-harness-kits-550-607n","title":"Holley HP EFI ECU \u0026 Harness Kit, GM LS2\/3\/7 58x Bosch-Style Connectors, NTK O2 | 550-607N","description":"\u003cp\u003eThe Holley HP EFI ECU and harness kit gives GM LS2\/LS3\/LS7 owners a plug-and-play way to control fuel and ignition, with room to grow into boost, nitrous, or water\/meth control as the build evolves. This version uses Jetronic\/Minitimer (Bosch-style) injector connectors compatible with Holley 522-xxx injectors, paired with an NTK wideband oxygen sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eECU certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eLaptop-programmable with a variety of included base maps\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eNTK oxygen sensor recommended for leaded or methanol fuels, high exhaust temperatures, and forced induction\u003c\/li\u003e\n\u003cli\u003eECU is fully potted for engine bay or interior mounting\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel strategy reduces time spent tuning\u003c\/li\u003e\n\u003cli\u003eMore functionality than OEM or competing ECUs — boost control, nitrous control, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eSimple plug-and-play installation into factory sensors, power, and grounds\u003c\/li\u003e\n\u003cli\u003eOptional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges available\u003c\/li\u003e\n\u003cli\u003eKit includes ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and NTK wideband O2 sensor\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS2\/LS3\/LS7\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type), fits Holley 522-xxx injectors\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-607N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for GM LS2\/LS3\/LS7 engines with factory GM coils and a 58-tooth crank sensor. If more than 4 inputs and 4 outputs are needed, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-607N fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and Jetronic\/Minitimer (Bosch-style) injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat injectors is this compatible with?\u003c\/h5\u003e\u003cp\u003eThe Jetronic\/Minitimer connectors on this kit fit Holley 522-xxx injectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to use this ECU?\u003c\/h5\u003e\u003cp\u003eThe ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges are also available.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and an NTK wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eCan this ECU control boost and nitrous?\u003c\/h5\u003e\u003cp\u003eYes. It has 4 programmable inputs and 4 programmable outputs that support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-607N fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and Jetronic\/Minitimer (Bosch-style) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What injectors is this compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Jetronic\/Minitimer connectors on this kit fit Holley 522-xxx injectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to use this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7 inch touchscreen, and digital gauges are also available.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and an NTK wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU control boost and nitrous?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It has 4 programmable inputs and 4 programmable outputs that support boost control, progressive nitrous, water\/meth injection, and more.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600280112,"sku":"GVMR_550-607N","price":3099.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-607n.jpg?v=1758386871"},{"product_id":"hp-efi-ecu-harness-kits-550-607","title":"Holley HP EFI ECU \u0026 Harness Kit, GM LS2\/3\/7 58x Bosch-Style Connectors, Bosch O2 | 550-607","description":"\u003cp\u003eThe Holley HP EFI ECU and harness kit gives GM LS2\/LS3\/LS7 owners a plug-and-play way to control fuel and ignition, with room to grow into boost, nitrous, or water\/meth control as the build evolves. This version uses Jetronic\/Minitimer (Bosch-style) injector connectors compatible with Holley 522-xxx injectors, paired with a Bosch wideband oxygen sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eECU certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eLaptop-programmable with a variety of included base maps\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eECU is fully potted for engine bay or interior mounting\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel strategy reduces time spent tuning\u003c\/li\u003e\n\u003cli\u003eMore functionality than OEM or competing ECUs — boost control, nitrous control, water\/meth injection, and more\u003c\/li\u003e\n\u003cli\u003eSimple plug-and-play installation into factory sensors, power, and grounds\u003c\/li\u003e\n\u003cli\u003eOptional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges available\u003c\/li\u003e\n\u003cli\u003eKit includes ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003eFree software and firmware updates available for download\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS2\/LS3\/LS7\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type), fits Holley 522-xxx injectors\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-607\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for GM LS2\/LS3\/LS7 engines with factory GM coils and a 58-tooth crank sensor. If more than 4 inputs and 4 outputs are needed, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-607 fit?\u003c\/h5\u003e\u003cp\u003eIt's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and Jetronic\/Minitimer (Bosch-style) injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat injectors is this compatible with?\u003c\/h5\u003e\u003cp\u003eThe Jetronic\/Minitimer connectors on this kit fit Holley 522-xxx injectors.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to use this ECU?\u003c\/h5\u003e\u003cp\u003eThe ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7\" touchscreen, and digital gauges are also available.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and a Bosch wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eAre software updates available?\u003c\/h5\u003e\u003cp\u003eYes, software and firmware updates can be downloaded free of charge.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-607 fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for GM LS2\/LS3\/LS7 engines with a 58x crank sensor and Jetronic\/Minitimer (Bosch-style) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What injectors is this compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Jetronic\/Minitimer connectors on this kit fit Holley 522-xxx injectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to use this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU is laptop-programmable and ships with a variety of base maps, though an optional plug-and-play handheld programmer, 5.7 inch touchscreen, and digital gauges are also available.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU, harness, communication cable, software, Jetronic\/Minitimer injector connectors, and a Bosch wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Are software updates available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, software and firmware updates can be downloaded free of charge.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600345648,"sku":"GVMR_550-607","price":2421.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/large550-607.jpg?v=1758386879"},{"product_id":"universal-v8-multi-point-fuel-injection-includes-ntk-oxygen-sensor-550-604n","title":"Holley HP EFI ECU \u0026 Harness Kit, Universal V8 MPFI, NTK Oxygen Sensor | 550-604N","description":"\u003cp\u003eLooking for a plug-and-play alternative for a stock or built late-model factory EFI engine, or a replacement for an older Holley C950 ECU? This HP EFI ECU and harness kit is built for universal V8 multi-point fuel injection applications, adding accurate fuel and ignition control plus optional nitrous, boost, or water\/meth control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCertified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003eAdvanced idle, closed-loop, and enrichment strategies for stable operation\u003c\/li\u003e\n\u003cli\u003eIgnition plug-and-play with GM HEI, Ford TFI, magnetic and hall-effect trigger, and other ignition systems\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control sensor inputs for one or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, works with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eEight sequentially driven 8:2 peak-and-hold injector drivers, supporting up to 16 low or high impedance injectors\u003c\/li\u003e\n\u003cli\u003eEight-channel Distributorless Ignition (DIS) outputs\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eInternal data logging with 2GB of memory\u003c\/li\u003e\n\u003cli\u003eTurbo boost control and 4-stage progressive nitrous control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy, speed density, Alpha-N, or combination fueling strategies\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Universal V8 multi-point fuel injection\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil (no timing control), Ford TFI, GM HEI small cap, or Holley Dual Sync distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, NTK wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-604N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat applications is the 550-604N designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for universal V8 multi-point fuel injection conversions, as a plug-and-play alternative to factory EFI or a replacement for an older Holley C950 ECU.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, Ford TFI, GM HEI small cap, and Holley Dual Sync distributor ignition types.\u003c\/p\u003e\u003ch5\u003eDoes it support boost and nitrous control?\u003c\/h5\u003e\u003cp\u003eYes, it includes turbo boost control and 4-stage progressive nitrous control, plus integrated water\/methanol injection control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe ECU, harness, communication cable, software, and an NTK wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eCan I data-log with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it includes internal data logging with 2GB of memory.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What applications is the 550-604N designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for universal V8 multi-point fuel injection conversions, as a plug-and-play alternative to factory EFI or a replacement for an older Holley C950 ECU.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, Ford TFI, GM HEI small cap, and Holley Dual Sync distributor ignition types.\"}},{\"@type\":\"Question\",\"name\":\"Does it support boost and nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes turbo boost control and 4-stage progressive nitrous control, plus integrated water\/methanol injection control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU, harness, communication cable, software, and an NTK wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Can I data-log with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes internal data logging with 2GB of memory.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600673328,"sku":"GVMR_550-604N","price":2999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/large550-604n.jpg?v=1758386917"},{"product_id":"universal-v8-multi-point-fuel-injection-includes-bosch-oxygen-sensor-550-604","title":"Holley HP EFI ECU \u0026 Harness Kit, Universal V8 MPFI, Bosch Oxygen Sensor | 550-604","description":"\u003cp\u003eLooking for a plug-and-play alternative for a stock or built late-model factory EFI engine, or a replacement for an older Holley C950 ECU? This HP EFI ECU and harness kit is built for universal V8 multi-point fuel injection applications, adding accurate fuel and ignition control plus optional nitrous, boost, or water\/meth control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCertified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance\u003c\/li\u003e\n\u003cli\u003eAdvanced idle, closed-loop, and enrichment strategies for stable operation\u003c\/li\u003e\n\u003cli\u003eIgnition plug-and-play with GM HEI, Ford TFI, magnetic and hall-effect trigger, and other ignition systems\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control sensor inputs for one or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, works with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eEight sequentially driven 8:2 peak-and-hold injector drivers, supporting up to 16 low or high impedance injectors\u003c\/li\u003e\n\u003cli\u003eEight-channel Distributorless Ignition (DIS) outputs\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eInternal data logging with 2GB of memory\u003c\/li\u003e\n\u003cli\u003eTurbo boost control and 4-stage progressive nitrous control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy, speed density, Alpha-N, or combination fueling strategies\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Universal V8 multi-point fuel injection\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil (no timing control), Ford TFI, GM HEI small cap, or Holley Dual Sync distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch type)\u003c\/li\u003e\n\u003cli\u003eInputs\/Outputs: 4 programmable inputs, 4 programmable outputs\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-5 Bar\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eWhat's Included: ECU, harness, communication cable, software, Bosch wideband O2 sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-604\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat applications is the 550-604 designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for universal V8 multi-point fuel injection conversions, as a plug-and-play alternative to factory EFI or a replacement for an older Holley C950 ECU.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, Ford TFI, GM HEI small cap, and Holley Dual Sync distributor ignition types.\u003c\/p\u003e\u003ch5\u003eDoes it support boost and nitrous control?\u003c\/h5\u003e\u003cp\u003eYes, it includes turbo boost control and 4-stage progressive nitrous control, plus integrated water\/methanol injection control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe ECU, harness, communication cable, software, and a Bosch wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eCan I data-log with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it includes internal data logging with 2GB of memory.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What applications is the 550-604 designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for universal V8 multi-point fuel injection conversions, as a plug-and-play alternative to factory EFI or a replacement for an older Holley C950 ECU.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, Ford TFI, GM HEI small cap, and Holley Dual Sync distributor ignition types.\"}},{\"@type\":\"Question\",\"name\":\"Does it support boost and nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes turbo boost control and 4-stage progressive nitrous control, plus integrated water\/methanol injection control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The ECU, harness, communication cable, software, and a Bosch wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Can I data-log with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes internal data logging with 2GB of memory.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600738864,"sku":"GVMR_550-604","price":2749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-604.jpg?v=1758386924"},{"product_id":"2013-2015-5-ford-coyote-ti-vct-hp-efi-kit-ntk-o2-uscar-inj-550-625n","title":"Holley Ford Coyote Ti-VCT HP EFI Kit, 2013-2015.5, NTK O2, USCAR Injectors | 550-625N","description":"\u003cp\u003eIntroducing Twin Independent Variable Cam Timing (Ti-VCT) control for the Ford Coyote from Holley EFI. Whether the build is a Coyote crate engine or a junkyard Coyote with locked cams, the Holley Plug and Play Ti-VCT Control Module unlocks the full potential of this high-revving platform.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with HP or Dominator EFI\u003c\/li\u003e\n\u003cli\u003eMain harnesses terminated with Ford TPS and IAC connectors, easing conversion from a drive-by-wire to a manual throttle body\u003c\/li\u003e\n\u003cli\u003eTi-VCT cam control down to 400 RPM\u003c\/li\u003e\n\u003cli\u003e4 built-in diagnostic LEDs simplify troubleshooting a cam or crank sensor failure\u003c\/li\u003e\n\u003cli\u003eCANBus communication between the Ti-VCT module and Holley EFI ECU for high-speed data transfer and diagnostics\u003c\/li\u003e\n\u003cli\u003eRequires an external MAP sensor; Holley recommends part number 538-13 for naturally aspirated applications\u003c\/li\u003e\n\u003cli\u003ePlug-and-play main harness for 2013-2015.5 Coyote engines with stock camshafts, compatible with Holley EFI coils (558-122) or stock coils (558-110)\u003c\/li\u003e\n\u003cli\u003eCommanded timing matched within 1 degree\u003c\/li\u003e\n\u003cli\u003eIntegrated stock cam position tables eliminate tuning guesswork for optimal drivability and power out of the box\u003c\/li\u003e\n\u003cli\u003eUser-programmable tables allow fine-tuning of aftermarket Ti-VCT compatible camshafts\u003c\/li\u003e\n\u003cli\u003eMain harness includes a power tap connector for adding sensors or actuators\u003c\/li\u003e\n\u003cli\u003ePre-calibrated Ford sensor drop-downs in the Holley EFI software\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 2013-2015.5 Ford Coyote, Ti-VCT\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Ford Coyote\u003c\/li\u003e\n\u003cli\u003eHarness Type: Ignition\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: HP EFI ECU, Ti-VCT controller kit, power harness, main harness, coil harness, injector harness, and sensors\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-625N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned to be used with a cable-driven throttle body; an external MAP sensor (Holley 538-13 recommended for N\/A applications) must be added separately.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Coyote engines does the 550-625N fit?\u003c\/h5\u003e\u003cp\u003eIt's built for 2013-2015.5 Ford Coyote engines with Ti-VCT cam control.\u003c\/p\u003e\u003ch5\u003eDoes it work with a drive-by-wire throttle body?\u003c\/h5\u003e\u003cp\u003eIt's designed to be used with a cable-driven throttle body; the main harness includes Ford TPS and IAC connectors to ease the conversion.\u003c\/p\u003e\u003ch5\u003eDo I need a separate MAP sensor?\u003c\/h5\u003e\u003cp\u003eYes, an external MAP sensor is required and is not included; Holley recommends part number 538-13 for naturally aspirated applications.\u003c\/p\u003e\u003ch5\u003eWhat ECU is this kit compatible with?\u003c\/h5\u003e\u003cp\u003eIt's compatible with either Holley HP or Dominator EFI.\u003c\/p\u003e\u003ch5\u003eHow does it diagnose a sensor failure?\u003c\/h5\u003e\u003cp\u003eIt has 4 built-in diagnostic LEDs that make it easy to identify a cam or crank sensor failure.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Coyote engines does the 550-625N fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for 2013-2015.5 Ford Coyote engines with Ti-VCT cam control.\"}},{\"@type\":\"Question\",\"name\":\"Does it work with a drive-by-wire throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to be used with a cable-driven throttle body; the main harness includes Ford TPS and IAC connectors to ease the conversion.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a separate MAP sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, an external MAP sensor is required and is not included; Holley recommends part number 538-13 for naturally aspirated applications.\"}},{\"@type\":\"Question\",\"name\":\"What ECU is this kit compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's compatible with either Holley HP or Dominator EFI.\"}},{\"@type\":\"Question\",\"name\":\"How does it diagnose a sensor failure?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It has 4 built-in diagnostic LEDs that make it easy to identify a cam or crank sensor failure.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600837168,"sku":"GVMR_550-625N","price":4149.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-625N_01.jpg?v=1758386933"},{"product_id":"2011-2012-ford-coyote-ti-vct-hp-efi-kit-ntk-o2-uscar-inj-550-619n","title":"Holley Ford Coyote Ti-VCT HP EFI Kit, 2011-2012, NTK O2, USCAR Injectors | 550-619N","description":"\u003cp\u003eIntroducing Twin Independent Variable Cam Timing (Ti-VCT) control for the Ford Coyote from Holley EFI. Whether the build is a Coyote crate engine or a junkyard Coyote with locked cams, the Holley Plug and Play Ti-VCT Control Module unlocks the full potential of this high-revving platform.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated stock cam position tables eliminate tuning guesswork for optimal drivability and power out of the box\u003c\/li\u003e\n\u003cli\u003eTi-VCT cam control down to 400 RPM\u003c\/li\u003e\n\u003cli\u003eMain harness includes a power tap connector for adding sensors or actuators\u003c\/li\u003e\n\u003cli\u003eCompatible with HP or Dominator EFI\u003c\/li\u003e\n\u003cli\u003eRequires an external MAP sensor; Holley recommends part number 538-13 for naturally aspirated applications\u003c\/li\u003e\n\u003cli\u003eCommanded timing matched within 1 degree\u003c\/li\u003e\n\u003cli\u003ePlug-and-play main harness for 2011-2017 Coyote engines with stock camshafts, compatible with Holley EFI coils (558-122)\u003c\/li\u003e\n\u003cli\u003eUser-programmable tables allow fine-tuning of aftermarket Ti-VCT compatible camshafts\u003c\/li\u003e\n\u003cli\u003eCANBus communication between the Ti-VCT module and Holley EFI ECU for high-speed data transfer and diagnostics\u003c\/li\u003e\n\u003cli\u003e4 built-in diagnostic LEDs simplify troubleshooting a cam or crank sensor failure\u003c\/li\u003e\n\u003cli\u003ePre-calibrated Ford sensor drop-downs in the Holley EFI software\u003c\/li\u003e\n\u003cli\u003eAlso supports 2015-2017 Coyote engines, and offers a plug-and-play main harness for stock coils (558-110)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 2011-2012 Ford Coyote, Ti-VCT (also supports 2015-2017)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Ford Coyote\u003c\/li\u003e\n\u003cli\u003eHarness Type: Ignition\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eWhat's Included: HP EFI ECU, Ti-VCT controller kit, power harness, main harness, coil harness, injector harness, and sensors\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-619N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned to be used with a cable-driven throttle body; an external MAP sensor (Holley 538-13 recommended for N\/A applications) must be added separately.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Coyote engines does the 550-619N fit?\u003c\/h5\u003e\u003cp\u003eIt's built for 2011-2012 Ford Coyote engines with Ti-VCT cam control, and also supports 2015-2017 Coyote engines.\u003c\/p\u003e\u003ch5\u003eDoes it work with a drive-by-wire throttle body?\u003c\/h5\u003e\u003cp\u003eIt's designed to be used with a cable-driven throttle body.\u003c\/p\u003e\u003ch5\u003eDo I need a separate MAP sensor?\u003c\/h5\u003e\u003cp\u003eYes, an external MAP sensor is required and is not included; Holley recommends part number 538-13 for naturally aspirated applications.\u003c\/p\u003e\u003ch5\u003eWhat ECU is this kit compatible with?\u003c\/h5\u003e\u003cp\u003eIt's compatible with either Holley HP or Dominator EFI.\u003c\/p\u003e\u003ch5\u003eHow does it diagnose a sensor failure?\u003c\/h5\u003e\u003cp\u003eIt has 4 built-in diagnostic LEDs that make it easy to identify a cam or crank sensor failure.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Coyote engines does the 550-619N fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for 2011-2012 Ford Coyote engines with Ti-VCT cam control, and also supports 2015-2017 Coyote engines.\"}},{\"@type\":\"Question\",\"name\":\"Does it work with a drive-by-wire throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to be used with a cable-driven throttle body.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a separate MAP sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, an external MAP sensor is required and is not included; Holley recommends part number 538-13 for naturally aspirated applications.\"}},{\"@type\":\"Question\",\"name\":\"What ECU is this kit compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's compatible with either Holley HP or Dominator EFI.\"}},{\"@type\":\"Question\",\"name\":\"How does it diagnose a sensor failure?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It has 4 built-in diagnostic LEDs that make it easy to identify a cam or crank sensor failure.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418600935472,"sku":"GVMR_550-619N","price":3228.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-619N_02.jpg?v=1758386939"},{"product_id":"2011-2012-ford-coyote-ti-vct-hp-efi-kit-bosch-o2-uscar-inj-550-619","title":"Holley 2011-2012 Ford Coyote Ti-VCT HP EFI Kit, Bosch O2 Sensor, USCAR Injector Connector | 550-619","description":"\u003cp\u003eThis plug-and-play Ti-VCT HP EFI kit unlocks Twin Independent Variable Cam Timing control for 2011-2012 Ford Coyote engines, whether it's powering a crate engine build or a junkyard Coyote with locked cams. The kit pairs a Holley EFI ECU with a dedicated Ti-VCT controller so cam timing, fuel, and spark are managed together.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTi-VCT cam control functions down to 400 RPM\u003c\/li\u003e\n\u003cli\u003e4 built-in diagnostic LEDs simplify troubleshooting of cam or crank sensor faults\u003c\/li\u003e\n\u003cli\u003eCommanded cam timing matched within 1 degree\u003c\/li\u003e\n\u003cli\u003eCANBus communication between the Ti-VCT controller and Holley EFI ECU for high-speed data transfer and diagnostics\u003c\/li\u003e\n\u003cli\u003eCompatible with HP or Dominator EFI\u003c\/li\u003e\n\u003cli\u003ePlug and Play main harness available for 2011-2017 Coyote engines with stock camshafts using Holley EFI coils (558-122) or stock coils (558-110)\u003c\/li\u003e\n\u003cli\u003eMain harness includes a Power Tap Connector for a convenient power\/ground source when adding sensors or actuators\u003c\/li\u003e\n\u003cli\u003eSupports 2015-2017 Coyote engines\u003c\/li\u003e\n\u003cli\u003ePre-calibrated Ford sensor drop-downs built into the Holley EFI software\u003c\/li\u003e\n\u003cli\u003eIntegrated stock cam position tables eliminate tuning guesswork for optimal drivability and power out of the box\u003c\/li\u003e\n\u003cli\u003eUser-programmable tables allow fine-tuning of aftermarket Ti-VCT-compatible camshafts\u003c\/li\u003e\n\u003cli\u003eMain harnesses come terminated with Ford TPS and IAC connectors, simplifying conversion from a drive-by-wire to a manual throttle body\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Ford Coyote\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Ford Coyote\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eHarness Type: Ignition\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eProduct Type: ECU Assembly\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-619\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned to be used with a cable-driven throttle body. An external MAP sensor is required for installation — Holley recommends part number 538-13 for naturally aspirated applications.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the Holley 550-619 Ti-VCT HP EFI Kit support?\u003c\/h5\u003e\u003cp\u003eIt's built for 2011-2012 Ford Coyote engines with Twin Independent Variable Cam Timing (Ti-VCT), including crate engines and locked-cam junkyard pulls.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, it includes a Bosch oxygen sensor.\u003c\/p\u003e\u003ch5\u003eWhat injector connector does this kit use?\u003c\/h5\u003e\u003cp\u003eUSCAR (EV6) injector connectors.\u003c\/p\u003e\u003ch5\u003eDo I need an external MAP sensor?\u003c\/h5\u003e\u003cp\u003eYes. Holley recommends part number 538-13 for naturally aspirated applications.\u003c\/p\u003e\u003ch5\u003eIs this compatible with a drive-by-wire throttle body?\u003c\/h5\u003e\u003cp\u003eIt's designed for use with a cable-driven throttle body.\u003c\/p\u003e\u003ch5\u003eHow low can Ti-VCT cam control go?\u003c\/h5\u003e\u003cp\u003eCam control functions down to 400 RPM, with commanded timing matched within 1 degree.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the Holley 550-619 Ti-VCT HP EFI Kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for 2011-2012 Ford Coyote engines with Twin Independent Variable Cam Timing (Ti-VCT), including crate engines and locked-cam junkyard pulls.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a Bosch oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector does this kit use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"USCAR (EV6) injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"Do I need an external MAP sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Holley recommends part number 538-13 for naturally aspirated applications.\"}},{\"@type\":\"Question\",\"name\":\"Is this compatible with a drive-by-wire throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for use with a cable-driven throttle body.\"}},{\"@type\":\"Question\",\"name\":\"How low can Ti-VCT cam control go?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Cam control functions down to 400 RPM, with commanded timing matched within 1 degree.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418601001008,"sku":"GVMR_550-619","price":3499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-619_02.jpg?v=1758386947"},{"product_id":"hp-efi-ecu-harness-kits-550-606n","title":"Holley HP EFI ECU \u0026 Harness Kit, Ford V8 MPFI, NTK Oxygen Sensor | 550-606N","description":"\u003cp\u003eHolley's HP EFI ECU and harness kit is a plug-in alternative for stock or built late-model factory Ford EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The HP ECU accurately manages fuel and ignition while adding control for nitrous, boost, or water\/meth injection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUnique lb\/hr based fueling strategy simplifies and standardizes tuning\u003c\/li\u003e\n\u003cli\u003e4-stage nitrous oxide control with fully featured nitrous management, eliminating the need for a separate controller\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, compatible with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eWet or Dry nitrous configuration with closed-loop feedback\u003c\/li\u003e\n\u003cli\u003eIntegrated Water\/Methanol injection control using Holley Water\/Meth solenoids calibrated as a percentage of injector flow\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003cli\u003e8-channel Distributorless Ignition (DIS) outputs drive \"Smart\" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)\u003c\/li\u003e\n\u003cli\u003eIncludes NTK wideband oxygen sensor\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, accepting one- or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eInternal data-logging standard with 2GB of memory\u003c\/li\u003e\n\u003cli\u003ePlug and Play ignition compatibility with GM 24x\/58x LSx, GM HEI, Ford TFI, magnetic, and hall-effect triggers\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIgnition Type: Coil (No Timing Control), Ford TFI, or Holley Dual Sync Distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eIncludes: HP EFI ECU, universal Ford V8 MPFI harness, Ford V8 injector harness, NTK oxygen sensor\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-606N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance. Free software and firmware updates are available for download.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's included in the Holley 550-606N kit?\u003c\/h5\u003e\u003cp\u003eThe HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and an NTK oxygen sensor.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, Ford TFI, or Holley Dual Sync Distributor ignition.\u003c\/p\u003e\u003ch5\u003eCan it control nitrous or boost?\u003c\/h5\u003e\u003cp\u003eYes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003ch5\u003eWhat injector connector style does it use?\u003c\/h5\u003e\u003cp\u003eJetronic\/Minitimer (Bosch) style connectors.\u003c\/p\u003e\u003ch5\u003eIs a handheld or laptop tuning device required?\u003c\/h5\u003e\u003cp\u003eAn optional 5.7\" full-color touchscreen LCD is available for on-the-fly tuning and data logging.\u003c\/p\u003e\u003ch5\u003eWhat certifications does the ECU carry?\u003c\/h5\u003e\u003cp\u003eIt's certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included in the Holley 550-606N kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and an NTK oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, Ford TFI, or Holley Dual Sync Distributor ignition.\"}},{\"@type\":\"Question\",\"name\":\"Can it control nitrous or boost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector style does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Jetronic\/Minitimer (Bosch) style connectors.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld or laptop tuning device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An optional 5.7-inch full-color touchscreen LCD is available for on-the-fly tuning and data logging.\"}},{\"@type\":\"Question\",\"name\":\"What certifications does the ECU carry?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418601066544,"sku":"GVMR_550-606N","price":2999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-606n.jpg?v=1758386954"},{"product_id":"hp-efi-ecu-harness-kits-550-606","title":"Holley HP EFI ECU \u0026 Harness Kit, Ford V8 MPFI, Bosch Oxygen Sensor | 550-606","description":"\u003cp\u003eHolley's HP EFI ECU and harness kit is a plug-in alternative for stock or built late-model factory Ford EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The HP ECU accurately manages fuel and ignition while adding control for nitrous, boost, or water\/meth injection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEight sequentially driven 8:2 peak-and-hold injector drivers, capable of running up to 16 low- or high-impedance injectors with multiple staged injector strategies\u003c\/li\u003e\n\u003cli\u003ePlug and Play control of factory GM 24x and 58x LSx engines\u003c\/li\u003e\n\u003cli\u003eControls both stepper and PWM Idle Air Control (IAC) motors\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eInternal data-logging standard with 2GB of memory\u003c\/li\u003e\n\u003cli\u003e4-stage nitrous oxide control, expandable to 4-stage progressive nitrous\u003c\/li\u003e\n\u003cli\u003eDedicated fuel and oil pressure inputs\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, accepting one- or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003e8-channel Distributorless Ignition (DIS) outputs drive \"Smart\" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel\u003c\/li\u003e\n\u003cli\u003eUnique lb\/hr based fueling strategy simplifies and standardizes tuning\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, compatible with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eIntegrated Water\/Methanol injection control using Holley Water\/Meth solenoids calibrated as a percentage of injector flow\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine grade connectors\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIgnition Type: Coil (No Timing Control), Ford TFI, or Holley Dual Sync Distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eIncludes: HP EFI ECU, universal Ford V8 MPFI harness, Ford V8 injector harness, Bosch oxygen sensor\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-606\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf utilizing the Ford OEM TPS and IAC sensors, a Ford connector (not supplied) must be wired in. ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance. Free software and firmware updates are available for download.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's included in the Holley 550-606 kit?\u003c\/h5\u003e\u003cp\u003eThe HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and a Bosch oxygen sensor.\u003c\/p\u003e\u003ch5\u003eDo I need extra parts to use factory Ford TPS and IAC sensors?\u003c\/h5\u003e\u003cp\u003eYes, if using the Ford OEM TPS and IAC sensors, you'll need to wire in a Ford connector, which is not supplied.\u003c\/p\u003e\u003ch5\u003eCan it control nitrous or boost?\u003c\/h5\u003e\u003cp\u003eYes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\u003c\/p\u003e\u003ch5\u003eHow many injectors can the ECU drive?\u003c\/h5\u003e\u003cp\u003eUp to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\u003c\/p\u003e\u003ch5\u003eIs a handheld or laptop tuning device required?\u003c\/h5\u003e\u003cp\u003eAn optional 5.7\" full-color touchscreen LCD is available for on-the-fly tuning and data logging.\u003c\/p\u003e\u003ch5\u003eWhat certifications does the ECU carry?\u003c\/h5\u003e\u003cp\u003eIt's certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included in the Holley 550-606 kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and a Bosch oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Do I need extra parts to use factory Ford TPS and IAC sensors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, if using the Ford OEM TPS and IAC sensors, you'll need to wire in a Ford connector, which is not supplied.\"}},{\"@type\":\"Question\",\"name\":\"Can it control nitrous or boost?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water\/meth injection, and more.\"}},{\"@type\":\"Question\",\"name\":\"How many injectors can the ECU drive?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld or laptop tuning device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An optional 5.7-inch full-color touchscreen LCD is available for on-the-fly tuning and data logging.\"}},{\"@type\":\"Question\",\"name\":\"What certifications does the ECU carry?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418601132080,"sku":"GVMR_550-606","price":2336.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-606.jpg?v=1758386962"},{"product_id":"unterminated-universal-harness-includes-ntk-oxygen-sensor-550-605n","title":"Holley HP EFI ECU \u0026 Unterminated Universal Harness Kit, NTK Oxygen Sensor | 550-605N","description":"\u003cp\u003eHolley's HP EFI ECU with an unterminated universal harness gives builders a plug-in alternative for stock or built late-model factory EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The unterminated harness lets you route and terminate wiring to fit a custom install.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUnique lb\/hr based fueling strategy simplifies and standardizes tuning\u003c\/li\u003e\n\u003cli\u003eIncludes NTK Wideband Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, accepting one- or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eInternal data-logging standard with 2GB of memory\u003c\/li\u003e\n\u003cli\u003eDedicated fuel and oil pressure inputs\u003c\/li\u003e\n\u003cli\u003eIntegrated Water\/Methanol injection control using Holley Water\/Meth solenoids calibrated as a percentage of injector flow\u003c\/li\u003e\n\u003cli\u003eEight sequentially driven 8:2 peak-and-hold injector drivers, capable of running up to 16 injectors with multiple staged strategies\u003c\/li\u003e\n\u003cli\u003e8-channel Distributorless Ignition (DIS) outputs drive \"Smart\" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)\u003c\/li\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003e4 programmable PWM outputs and 4 fully configurable inputs\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine grade connectors\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIgnition Type: Coil (No Timing Control), Ford TFI, GM HEI Small Cap, or Holley Dual Sync Distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: NTK\u003c\/li\u003e\n\u003cli\u003eHarness Type: Unterminated Universal\u003c\/li\u003e\n\u003cli\u003eProduct Type: EFI System\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-605N\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does \"unterminated\" mean for this harness?\u003c\/h5\u003e\u003cp\u003eThe harness wiring isn't pre-fitted with vehicle-specific connectors, so it can be custom-routed and terminated for a wide range of applications.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, it includes an NTK wideband oxygen sensor.\u003c\/p\u003e\u003ch5\u003eWhat ignition types does this ECU support?\u003c\/h5\u003e\u003cp\u003eCoil with no timing control, Ford TFI, GM HEI small cap, or Holley Dual Sync Distributor ignition.\u003c\/p\u003e\u003ch5\u003eHow many injectors can the ECU drive?\u003c\/h5\u003e\u003cp\u003eUp to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\u003c\/p\u003e\u003ch5\u003eWhat injector connector style does it use?\u003c\/h5\u003e\u003cp\u003eJetronic\/Minitimer (Bosch) style connectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does unterminated mean for this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The harness wiring isn't pre-fitted with vehicle-specific connectors, so it can be custom-routed and terminated for a wide range of applications.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes an NTK wideband oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"What ignition types does this ECU support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Coil with no timing control, Ford TFI, GM HEI small cap, or Holley Dual Sync Distributor ignition.\"}},{\"@type\":\"Question\",\"name\":\"How many injectors can the ECU drive?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector style does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Jetronic\/Minitimer (Bosch) style connectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418601197616,"sku":"GVMR_550-605N","price":2999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-605N_02.jpg?v=1758386969"},{"product_id":"unterminated-universal-harness-includes-bosch-oxygen-sensor-550-605","title":"Holley HP EFI ECU \u0026 Unterminated Universal Harness Kit, Bosch Oxygen Sensor | 550-605","description":"\u003cp\u003eHolley's HP EFI ECU with an unterminated universal harness gives builders a plug-in alternative for stock or built late-model factory EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The unterminated harness lets you route and terminate wiring to fit a custom install.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1-5 Bar MAP sensor capability\u003c\/li\u003e\n\u003cli\u003eOption for VE-based fueling strategy in addition to speed density, Alpha-N, or combination strategies\u003c\/li\u003e\n\u003cli\u003e4-stage nitrous oxide control, expandable to 4-stage progressive nitrous\u003c\/li\u003e\n\u003cli\u003eIntegrated single-channel wideband oxygen sensor control, compatible with NTK or Bosch sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated Boost Control with boost vs. time, gear, RPM, or speed, launch control, and over-boost safeties\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, accepting one- or two-wire knock sensors\u003c\/li\u003e\n\u003cli\u003e8-channel Distributorless Ignition (DIS) outputs drive \"Smart\" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)\u003c\/li\u003e\n\u003cli\u003eConfigurable user password protection\u003c\/li\u003e\n\u003cli\u003eFuel map and learn function smoothing\u003c\/li\u003e\n\u003cli\u003eInternal data-logging standard with 2GB of memory\u003c\/li\u003e\n\u003cli\u003eData logger with scalable axes, smoothing, and multiple graph views\u003c\/li\u003e\n\u003cli\u003eOptional 5.7\" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel\u003c\/li\u003e\n\u003cli\u003e\"Quick Start\" ignition and fueling strategy for LSx engines, plus quick-start fueling for all engines\u003c\/li\u003e\n\u003cli\u003eTraction control via timing, nitrous percentage, or boost reduction (requires Davis Technologies Holley module)\u003c\/li\u003e\n\u003cli\u003eEight sequentially driven 8:2 peak-and-hold injector drivers, capable of running up to 16 injectors with multiple staged strategies\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIgnition Type: Coil (No Timing Control), Ford TFI, GM HEI Small Cap, or Holley Dual Sync Distributor\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch)\u003c\/li\u003e\n\u003cli\u003eOxygen Sensor: Bosch\u003c\/li\u003e\n\u003cli\u003eHarness Type: Unterminated Universal\u003c\/li\u003e\n\u003cli\u003eProduct Type: HP EFI Kit\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-605\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance. Free software and firmware updates are available for download.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does \"unterminated\" mean for this harness?\u003c\/h5\u003e\u003cp\u003eThe harness wiring isn't pre-fitted with vehicle-specific connectors, so it can be custom-routed and terminated for a wide range of applications.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, it includes a Bosch oxygen sensor.\u003c\/p\u003e\u003ch5\u003eDoes this ECU support boost or traction control?\u003c\/h5\u003e\u003cp\u003eYes, it includes integrated boost control (time, gear, RPM, or speed based) and traction control via timing, nitrous, or boost reduction with a Davis Technologies Holley module.\u003c\/p\u003e\u003ch5\u003eHow many injectors can the ECU drive?\u003c\/h5\u003e\u003cp\u003eUp to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\u003c\/p\u003e\u003ch5\u003eIs a handheld or laptop tuning device required?\u003c\/h5\u003e\u003cp\u003eAn optional 5.7\" full-color touchscreen LCD is available for on-the-fly tuning and data logging.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does unterminated mean for this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The harness wiring isn't pre-fitted with vehicle-specific connectors, so it can be custom-routed and terminated for a wide range of applications.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a Bosch oxygen sensor.\"}},{\"@type\":\"Question\",\"name\":\"Does this ECU support boost or traction control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes integrated boost control (time, gear, RPM, or speed based) and traction control via timing, nitrous, or boost reduction with a Davis Technologies Holley module.\"}},{\"@type\":\"Question\",\"name\":\"How many injectors can the ECU drive?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld or laptop tuning device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An optional 5.7-inch full-color touchscreen LCD is available for on-the-fly tuning and data logging.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418601328688,"sku":"GVMR_550-605","price":2749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-605_02.jpg?v=1758386978"},{"product_id":"dominator-efi-kit-ls2-main-harness-w-dbw-with-ev1-injector-harnesses-550-659","title":"Holley EFI Dominator EFI Main Harness, LS2\/LS3\/LS7 DBW w\/ EV1 Injector Harness | 550-659","description":"\u003cp\u003eThis Dominator EFI main harness is built for GM LS2\/LS3\/LS7 engines with a 58x crank \/ 4x cam trigger setup, EV1-style injectors, and Drive-By-Wire throttle body control. Dominator EFI systems are sold a la carte, so this harness is one piece of a complete build — you'll also need a Dominator ECU, main power harness, wideband oxygen sensor, ignition adapter harness, and related accessories.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: GM LS2\/LS3\/LS7\u003c\/li\u003e\n\u003cli\u003eApplication: 58x crank, 4x cam trigger, EV1 injectors, Drive-By-Wire throttle body\u003c\/li\u003e\n\u003cli\u003eLength: 13.14\" overall\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eCertification: ISO 8846, SAE J1171, and U.S. Coast Guard ignition-protection and fire-resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-659\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen running a transbrake, Holley requires either a relay or its transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this harness include the Dominator ECU?\u003c\/h5\u003e\u003cp\u003eNo, Dominator EFI systems are sold a la carte — this listing is the main engine harness only. A complete system also needs the ECU, main power harness, wideband oxygen sensor, and ignition adapter harness.\u003c\/p\u003e\u003ch5\u003eWhat engines is this harness built for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS2\/LS3\/LS7 engines with a 58x crank \/ 4x cam trigger setup, EV1 injectors, and Drive-By-Wire throttle body control.\u003c\/p\u003e\u003ch5\u003eDo I need anything extra if I'm running a transbrake?\u003c\/h5\u003e\u003cp\u003eYes, Holley requires a relay or its transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake is released.\u003c\/p\u003e\u003ch5\u003eIs this harness ignition-protected for marine use?\u003c\/h5\u003e\u003cp\u003eYes, it's certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this harness include the Dominator ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, Dominator EFI systems are sold a la carte — this listing is the main engine harness only. A complete system also needs the ECU, main power harness, wideband oxygen sensor, and ignition adapter harness.\"}},{\"@type\":\"Question\",\"name\":\"What engines is this harness built for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS2\/LS3\/LS7 engines with a 58x crank \/ 4x cam trigger setup, EV1 injectors, and Drive-By-Wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything extra if I'm running a transbrake?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, Holley requires a relay or its transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake is released.\"}},{\"@type\":\"Question\",\"name\":\"Is this harness ignition-protected for marine use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418617745456,"sku":"GVMR_550-659","price":3599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost.png?v=1758387885"},{"product_id":"dominator-efi-kit-ls1-main-harness-w-trans-and-dbw-with-ev1-injector-harness-550-657","title":"Holley Dominator EFI Main Harness Kit, LS1\/LS2\/LS6 24x, Trans + DBW Control | 550-657","description":"\u003cp\u003eHolley's Dominator EFI Vehicle Management System is built for non-emissions street and race engines, with integrated transmission control, drive-by-wire throttle control, dual wideband oxygen sensor inputs, and enough onboard I\/O to run boost, nitrous, and water\/meth control without extra controllers. This kit bundles the main engine harness and EV1 injector harness for a GM LS 24x crank \/ 1x cam (LS1\/LS2\/LS6-style) engine, wired for 4L60E\/4L80E transmission control and drive-by-wire throttle body operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy that learns as you drive\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control (NTK or Bosch sensors)\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control, eliminating the need for a separate boost controller\u003c\/li\u003e\n\u003cli\u003e8-stage nitrous oxide control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock sensor inputs (1-wire or 2-wire sensors)\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eIntegrated drive-by-wire throttle body control, supporting up to two DBW throttle bodies (GM, Chrysler, Ford, and Nissan compatible)\u003c\/li\u003e\n\u003cli\u003eInternal 4GB data logger with strip chart and smoothing tools\u003c\/li\u003e\n\u003cli\u003eStore up to four calibrations with the optional Multi Map Selector (558-407)\u003c\/li\u003e\n\u003cli\u003eFully configurable laptop gauge panel\u003c\/li\u003e\n\u003cli\u003eSealed automotive\/marine-grade connectors and a fully potted ECU\u003c\/li\u003e\n\u003cli\u003eCompatible with optional 7\" Digital Dash (553-106), 3.5\" Touch Screen LCD (553-108), and 12.3\" Pro Dash (553-111)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: GM LS1\/LS2\/LS6 (24x crank, 1x cam, EV1 injectors)\u003c\/li\u003e\n\u003cli\u003eTransmission Control: GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire Throttle Control: Yes\u003c\/li\u003e\n\u003cli\u003eECU Height: Variable, 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eECU Length: 13.14\" overall\u003c\/li\u003e\n\u003cli\u003eECU Width: 6.10\" overall\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eProduct Type: Dominator ECU\/ECM\/VCM\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-657\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, Holley requires installing either a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake releases. Dominator EFI systems are sold a la carte — a complete install also requires the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness in addition to this kit. The ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS2\/LS6-style) running EV1-style fuel injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Dominator ECU?\u003c\/h5\u003e\u003cp\u003eYes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this harness control my transmission?\u003c\/h5\u003e\u003cp\u003eYes, this version is wired for integrated electronic control of GM 4L60E and 4L80E transmissions.\u003c\/p\u003e\u003ch5\u003eDoes this support drive-by-wire throttle control?\u003c\/h5\u003e\u003cp\u003eYes, this harness supports drive-by-wire throttle body control for up to two DBW throttle bodies, including GM, Chrysler, Ford, and Nissan-compatible units.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for a complete Dominator EFI install?\u003c\/h5\u003e\u003cp\u003eDominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\u003c\/p\u003e\u003ch5\u003eIs a transbrake protection device required?\u003c\/h5\u003e\u003cp\u003eIf you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS2\/LS6-style) running EV1-style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Dominator ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this harness control my transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, this version is wired for integrated electronic control of GM 4L60E and 4L80E transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Does this support drive-by-wire throttle control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, this harness supports drive-by-wire throttle body control for up to two DBW throttle bodies, including GM, Chrysler, Ford, and Nissan-compatible units.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for a complete Dominator EFI install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\"}},{\"@type\":\"Question\",\"name\":\"Is a transbrake protection device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418618302512,"sku":"GVMR_550-657","price":3699.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_0d8612ea-b640-4fd6-959a-2e3f2957e822.png?v=1758387937"},{"product_id":"dominator-efi-kit-ls1-main-harness-w-trans-control-with-ev1-injector-harness-550-656","title":"Holley Dominator EFI Main Harness Kit, LS1\/LS2\/LS6 24x, Trans Control | 550-656","description":"\u003cp\u003eHolley's Dominator EFI Vehicle Management System is built for non-emissions street and race engines, with integrated transmission control, drive-by-wire throttle control, dual wideband oxygen sensor inputs, and enough onboard I\/O to run boost, nitrous, and water\/meth control without extra controllers. This kit bundles the main engine harness and EV1 injector harness for a GM LS 24x crank \/ 1x cam (LS1\/LS2\/LS6-style) engine, wired for 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy that learns as you drive\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control (NTK or Bosch sensors)\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control, eliminating the need for a separate boost controller\u003c\/li\u003e\n\u003cli\u003e8-stage nitrous oxide control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock sensor inputs (1-wire or 2-wire sensors)\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eInternal 4GB data logger with strip chart and smoothing tools\u003c\/li\u003e\n\u003cli\u003eStore up to four calibrations with the optional Multi Map Selector (558-407)\u003c\/li\u003e\n\u003cli\u003eFully configurable laptop gauge panel\u003c\/li\u003e\n\u003cli\u003eSealed automotive\/marine-grade connectors and a fully potted ECU\u003c\/li\u003e\n\u003cli\u003eCompatible with optional 7\" Digital Dash (553-106), 3.5\" Touch Screen LCD (553-108), and 12.3\" Pro Dash (553-111)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: GM LS1\/LS2\/LS6 (24x crank, 1x cam, EV1 injectors)\u003c\/li\u003e\n\u003cli\u003eTransmission Control: GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire Wiring: Not included in this harness (see 550-657)\u003c\/li\u003e\n\u003cli\u003eECU Height: Variable, 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eECU Length: 13.14\" overall\u003c\/li\u003e\n\u003cli\u003eECU Width: 6.10\" overall\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eProduct Type: Dominator ECU\/ECM\/VCM\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-656\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, Holley requires installing either a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake releases. Dominator EFI systems are sold a la carte — a complete install also requires the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness in addition to this kit. The ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS2\/LS6-style) running EV1-style fuel injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Dominator ECU?\u003c\/h5\u003e\u003cp\u003eYes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this harness control my transmission?\u003c\/h5\u003e\u003cp\u003eYes, this version is wired for integrated electronic control of GM 4L60E and 4L80E transmissions.\u003c\/p\u003e\u003ch5\u003eDoes this support drive-by-wire throttle control?\u003c\/h5\u003e\u003cp\u003eNot in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for a complete Dominator EFI install?\u003c\/h5\u003e\u003cp\u003eDominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\u003c\/p\u003e\u003ch5\u003eIs a transbrake protection device required?\u003c\/h5\u003e\u003cp\u003eIf you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS2\/LS6-style) running EV1-style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Dominator ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this harness control my transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, this version is wired for integrated electronic control of GM 4L60E and 4L80E transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Does this support drive-by-wire throttle control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for a complete Dominator EFI install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\"}},{\"@type\":\"Question\",\"name\":\"Is a transbrake protection device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418618400816,"sku":"GVMR_550-656","price":3599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_310898b7-1b02-413e-8bf1-b0d8360aa000.png?v=1758387945"},{"product_id":"fits-gm-ls-58x-crank-4x-cam-4-8-5-3-6-0-style-engines-with-ev1-injectors-550-651","title":"Holley Dominator EFI Main Harness Kit, LS2\/LS3\/LS7 58x, EV1 Injectors | 550-651","description":"\u003cp\u003eHolley's Dominator EFI Vehicle Management System is built for non-emissions street and race engines, with integrated transmission control, drive-by-wire throttle control, dual wideband oxygen sensor inputs, and enough onboard I\/O to run boost, nitrous, and water\/meth control without extra controllers. This kit bundles the main engine harness and EV1 injector harness for a GM LS 58x crank \/ 4x cam (4.8\/5.3\/6.0-style late truck) engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy that learns as you drive\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control (NTK or Bosch sensors)\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control, eliminating the need for a separate boost controller\u003c\/li\u003e\n\u003cli\u003e8-stage nitrous oxide control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock sensor inputs (1-wire or 2-wire sensors)\u003c\/li\u003e\n\u003cli\u003eInternal 4GB data logger with strip chart and smoothing tools\u003c\/li\u003e\n\u003cli\u003eStore up to four calibrations with the optional Multi Map Selector (558-407)\u003c\/li\u003e\n\u003cli\u003eFully configurable laptop gauge panel\u003c\/li\u003e\n\u003cli\u003eSealed automotive\/marine-grade connectors and a fully potted ECU\u003c\/li\u003e\n\u003cli\u003eCompatible with optional 7\" Digital Dash (553-106), 3.5\" Touch Screen LCD (553-108), and 12.3\" Pro Dash (553-111)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003cli\u003eTransmission control and drive-by-wire throttle control capable with the correct harness variant\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: GM LS2\/LS3\/LS7 (58x crank, 4x cam, 4.8\/5.3\/6.0-style, EV1 injectors)\u003c\/li\u003e\n\u003cli\u003eTransmission Control Wiring: Not included in this harness (see 550-656 or 550-657 for trans-control-wired kits)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire Wiring: Not included in this harness (see 550-657)\u003c\/li\u003e\n\u003cli\u003eECU Height: Variable, 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eECU Length: 13.14\" overall\u003c\/li\u003e\n\u003cli\u003eECU Width: 6.10\" overall\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eProduct Type: Dominator ECU\/ECM\/VCM\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-651\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, Holley requires installing either a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake releases. Dominator EFI systems are sold a la carte — a complete install also requires the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness in addition to this kit. The ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines with a 58x crank and 4x cam signal — the 4.8\/5.3\/6.0-style late truck engines — running EV1-style fuel injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Dominator ECU?\u003c\/h5\u003e\u003cp\u003eYes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this harness control my transmission?\u003c\/h5\u003e\u003cp\u003eNo, this kit provides the base engine harness only. For integrated GM 4L60E\/4L80E transmission control, choose a Dominator harness variant wired for trans control.\u003c\/p\u003e\u003ch5\u003eDoes this support drive-by-wire throttle control?\u003c\/h5\u003e\u003cp\u003eNot in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for a complete Dominator EFI install?\u003c\/h5\u003e\u003cp\u003eDominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\u003c\/p\u003e\u003ch5\u003eIs a transbrake protection device required?\u003c\/h5\u003e\u003cp\u003eIf you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines with a 58x crank and 4x cam signal — the 4.8\/5.3\/6.0-style late truck engines — running EV1-style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Dominator ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this harness control my transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit provides the base engine harness only. For integrated GM 4L60E\/4L80E transmission control, choose a Dominator harness variant wired for trans control.\"}},{\"@type\":\"Question\",\"name\":\"Does this support drive-by-wire throttle control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for a complete Dominator EFI install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\"}},{\"@type\":\"Question\",\"name\":\"Is a transbrake protection device required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418618466352,"sku":"GVMR_550-651","price":3299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_524122b4-4d6c-4a4a-9c22-efbfd42fab33.png?v=1758387953"},{"product_id":"fits-gm-ls-24x-crank-1x-cam-ls1-ls6-style-engines-with-ev1-injectors-550-650","title":"Holley Dominator EFI Main Harness Kit, LS1\/LS6 24x, EV1 Injectors | 550-650","description":"\u003cp\u003eHolley's Dominator EFI Vehicle Management System is built for non-emissions street and race engines, with integrated transmission control, drive-by-wire throttle control, dual wideband oxygen sensor inputs, and enough onboard I\/O to run boost, nitrous, and water\/meth control without extra controllers. This kit bundles the main engine harness and EV1 injector harness for a GM LS 24x crank \/ 1x cam (LS1\/LS6-style) engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy that learns as you drive\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control (NTK or Bosch sensors)\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control, eliminating the need for a separate boost controller\u003c\/li\u003e\n\u003cli\u003e8-stage nitrous oxide control\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock sensor inputs (1-wire or 2-wire sensors)\u003c\/li\u003e\n\u003cli\u003eInternal 4GB data logger with strip chart and smoothing tools\u003c\/li\u003e\n\u003cli\u003eStore up to four calibrations with the optional Multi Map Selector (558-407)\u003c\/li\u003e\n\u003cli\u003eFully configurable laptop gauge panel\u003c\/li\u003e\n\u003cli\u003eSealed automotive\/marine-grade connectors and a fully potted ECU\u003c\/li\u003e\n\u003cli\u003eCompatible with optional 7\" Digital Dash (553-106), 3.5\" Touch Screen LCD (553-108), and 12.3\" Pro Dash (553-111)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003cli\u003eTransmission control and drive-by-wire throttle control capable with the correct harness variant\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: GM LS1\/LS6 (24x crank, 1x cam, EV1 injectors)\u003c\/li\u003e\n\u003cli\u003eTransmission Control Wiring: Not included in this harness (see 550-656 or 550-657 for trans-control-wired kits)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire Wiring: Not included in this harness (see 550-657)\u003c\/li\u003e\n\u003cli\u003eECU Height: Variable, 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eECU Length: 13.14\" overall\u003c\/li\u003e\n\u003cli\u003eECU Width: 6.10\" overall\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eProduct Type: Dominator ECU\/ECM\/VCM\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-650\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, Holley requires installing either a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake releases. Dominator EFI systems are sold a la carte — a complete install also requires the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness in addition to this kit. The ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engine does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS6-style) running EV1-style fuel injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Dominator ECU?\u003c\/h5\u003e\u003cp\u003eYes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this harness control my transmission?\u003c\/h5\u003e\u003cp\u003eNo, this kit provides the base engine harness only. For integrated GM 4L60E\/4L80E transmission control, choose a Dominator harness variant wired for trans control.\u003c\/p\u003e\u003ch5\u003eDoes this support drive-by-wire throttle control?\u003c\/h5\u003e\u003cp\u003eNot in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\u003c\/p\u003e\u003ch5\u003eWhat else do I need for a complete Dominator EFI install?\u003c\/h5\u003e\u003cp\u003eDominator EFI systems are sold a la carte. In addition to this harness kit you'll need the Main Power Harness, Wideband Oxygen Sensor, and Ignition Adapter Harness to complete the system.\u003c\/p\u003e\u003ch5\u003eIs a transbrake protection device required?\u003c\/h5\u003e\u003cp\u003eIf you're running a transbrake, Holley requires a relay or the Transbrake Input Protection Device (554-128) to protect the ECU from flyback voltage when the transbrake is released.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engine does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS engines with a 24x crank and 1x cam signal (LS1\/LS6-style) running EV1-style fuel injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Dominator ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes the Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this harness control my transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit provides the base engine harness only. For integrated GM 4L60E\/4L80E transmission control, choose a Dominator harness variant wired for trans control.\"}},{\"@type\":\"Question\",\"name\":\"Does this support drive-by-wire throttle control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not in this configuration. For drive-by-wire throttle body support, use the 550-657 harness variant.\"}},{\"@type\":\"Question\",\"name\":\"What else do I need for a complete Dominator EFI install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI systems are sold a la carte. 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This kit supplies the main engine harness for conventional push-rod Ford small block engines using EV1-style injectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine application: Ford Small Block (conventional push-rod)\u003c\/li\u003e\n\u003cli\u003eInjector connector type: EV1\u003c\/li\u003e\n\u003cli\u003eHarness scope: Main engine harness only — Dominator ECU, power harness, wideband oxygen sensor, injector harness, ignition adapter harness, and accessories are sold separately\u003c\/li\u003e\n\u003cli\u003eCertifications: ISO 8846, SAE J1171, and U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-653\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, a relay or Holley's Transbrake input protection device (554-128) is required to protect the ECU from flyback voltage.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this harness include the ECU?\u003c\/h5\u003e\u003cp\u003eNo — Dominator EFI systems are sold a la carte. This listing is the main engine harness only; the ECU, power harness, wideband sensor, injector harness, and ignition adapter harness are purchased separately.\u003c\/p\u003e\u003ch5\u003eWhat injector connector does this harness use?\u003c\/h5\u003e\u003cp\u003eEV1-style injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat engines is this harness designed for?\u003c\/h5\u003e\u003cp\u003eConventional push-rod Ford small block engines.\u003c\/p\u003e\u003ch5\u003eDo I need extra protection if I'm running a transbrake?\u003c\/h5\u003e\u003cp\u003eYes — install a relay or Holley's Transbrake input protection device (554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this harness include the ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — Dominator EFI systems are sold a la carte. This listing is the main engine harness only; the ECU, power harness, wideband sensor, injector harness, and ignition adapter harness are purchased separately.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector does this harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"EV1-style injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What engines is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Conventional push-rod Ford small block engines.\"}},{\"@type\":\"Question\",\"name\":\"Do I need extra protection if I'm running a transbrake?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — install a relay or Holley's Transbrake input protection device (554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418618662960,"sku":"GVMR_550-653","price":3299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_170ff589-1368-4660-977f-773c54401ff4.png?v=1758387976"},{"product_id":"with-coil-on-plug-main-and-sub-harness-with-ev1-injector-harness-550-655","title":"Holley Dominator EFI Kit, Ford COP Main Harness with EV1 Injector Harness | 550-655","description":"\u003cp\u003eDominator EFI Vehicle Management Systems are built for non-emissions street and racing engines, with transmission control, drive-by-wire, and dual wideband oxygen sensor options that give the ECU nearly unlimited capability to control any power adder, input, or output. This kit provides the main and sub harnesses for conventional push rod Ford engines running coil-on-plug (COP) ignition and EV1 injectors, eliminating the need for additional standalone controllers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated drive-by-wire throttle body control for two DBW throttle bodies (GM, Chrysler, Ford, and Nissan compatible)\u003c\/li\u003e\n\u003cli\u003eTwo-nozzle progressive nitrous oxide control, 8 stages, by time, RPM, or boost (requires part 554-111)\u003c\/li\u003e\n\u003cli\u003eLean or rich safety cutoff\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, compatible with 1- or 2-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eOnboard data logger with smoothing, multiple graph views, and notes fields; 4 GB internal memory\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control for both engine banks (NTK or Bosch)\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy with fuel map smoothing\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control with configurable timing retard per stage\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eOptional digital displays: 7\" Digital Dash (553-106) or 3.5\" Touch Screen LCD (553-108)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: Ford Small Block\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil-on-Plug (COP)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV1\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eMAP Sensor Range: 1-7 Bar\u003c\/li\u003e\n\u003cli\u003eECU Dimensions: 13.14\" length x 6.10\" width, height variable 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eCertification: ISO 8846, SAE J1171 \u0026amp; U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-655\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDominator EFI systems are sold à la carte — a complete system requires the ECU, main power harness, wideband oxygen sensor, engine main harness, injector harness, ignition adapter harness, and accessories, each purchased separately as needed. If running a transbrake, Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eConventional push rod Ford engines running coil-on-plug ignition and EV1 injectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this control a transmission?\u003c\/h5\u003e\u003cp\u003eYes — the Dominator ECU offers integrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W transmissions.\u003c\/p\u003e\u003ch5\u003eDoes this system support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\u003c\/p\u003e\u003ch5\u003eDo I need anything else to run this on a transbrake car?\u003c\/h5\u003e\u003cp\u003eYes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch5\u003eIs this a complete standalone EFI system by itself?\u003c\/h5\u003e\u003cp\u003eDominator EFI is sold à la carte. This kit provides the ECU, main harness, injector harness, and wideband sensor — additional accessories like a digital dash or transbrake protection device are purchased separately depending on your build.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Conventional push rod Ford engines running coil-on-plug ignition and EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this control a transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — the Dominator ECU offers integrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to run this on a transbrake car?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}},{\"@type\":\"Question\",\"name\":\"Is this a complete standalone EFI system by itself?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI is sold a la carte. This kit provides the ECU, main harness, injector harness, and wideband sensor - additional accessories like a digital dash or transbrake protection device are purchased separately depending on your build.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418620071984,"sku":"GVMR_550-655","price":3499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_1a21dc8c-4cae-4605-b1b4-0c8865b15812.png?v=1758388106"},{"product_id":"with-coil-on-plug-main-and-sub-harness-with-ev1-injector-harness-550-654","title":"Holley Dominator EFI Kit, Universal COP Main Harness with EV1 Injector Harness | 550-654","description":"\u003cp\u003eDominator EFI Vehicle Management Systems are built for non-emissions street and racing engines, with transmission control, drive-by-wire, and dual wideband oxygen sensor options that give the ECU nearly unlimited capability to control any power adder, input, or output. This kit provides the main and sub harnesses for conventional push rod Chevrolet and Chrysler engines running coil-on-plug (COP) ignition and EV1 injectors, eliminating the need for additional standalone controllers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated drive-by-wire throttle body control for two DBW throttle bodies (GM, Chrysler, Ford, and Nissan compatible)\u003c\/li\u003e\n\u003cli\u003eTwo-nozzle progressive nitrous oxide control, 8 stages, by time, RPM, or boost (requires part 554-111)\u003c\/li\u003e\n\u003cli\u003eLean or rich safety cutoff\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, compatible with 1- or 2-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eOnboard data logger with smoothing, multiple graph views, and notes fields; 4 GB internal memory\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W\u003c\/li\u003e\n\u003cli\u003eIntegrated dual-channel wideband oxygen sensor control for both engine banks (NTK or Bosch)\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy with fuel map smoothing\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control with configurable timing retard per stage\u003c\/li\u003e\n\u003cli\u003eIntegrated water\/methanol injection control using Holley-calibrated solenoids\u003c\/li\u003e\n\u003cli\u003eOptional digital displays: 7\" Digital Dash (553-106) or 3.5\" Touch Screen LCD (553-108)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: Chevy Small and Big Block\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Coil-on-Plug (COP)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV1\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eMAP Sensor Range: 1-7 Bar\u003c\/li\u003e\n\u003cli\u003eECU Dimensions: 13.14\" length x 6.10\" width, height variable 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eCertification: ISO 8846, SAE J1171 \u0026amp; U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-654\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDominator EFI systems are sold à la carte — a complete system requires the ECU, main power harness, wideband oxygen sensor, engine main harness, injector harness, ignition adapter harness, and accessories, each purchased separately as needed. If running a transbrake, Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eConventional push rod Chevrolet and Chrysler engines running coil-on-plug ignition and EV1 injectors.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eCan this control a transmission?\u003c\/h5\u003e\u003cp\u003eYes — the Dominator ECU offers integrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W transmissions.\u003c\/p\u003e\u003ch5\u003eDoes this system support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\u003c\/p\u003e\u003ch5\u003eDo I need anything else to run this on a transbrake car?\u003c\/h5\u003e\u003cp\u003eYes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch5\u003eIs this a complete standalone EFI system by itself?\u003c\/h5\u003e\u003cp\u003eDominator EFI is sold à la carte. This kit provides the ECU, main harness, injector harness, and wideband sensor — additional accessories like a digital dash or transbrake protection device are purchased separately depending on your build.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Conventional push rod Chevrolet and Chrysler engines running coil-on-plug ignition and EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Can this control a transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — the Dominator ECU offers integrated electronic transmission control for GM 4L60E\/4L80E and Ford AODE\/4R70W transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to run this on a transbrake car?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}},{\"@type\":\"Question\",\"name\":\"Is this a complete standalone EFI system by itself?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI is sold a la carte. 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This kit provides the main harness for GM LS2\/LS3\/LS7 (58x crank, 4x cam, 4.8\/5.3\/6.0-style) engines running EV1 injectors, a 4L60E\/4L80E transmission, and a drive-by-wire throttle body.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated drive-by-wire throttle body control for two DBW throttle bodies (GM, Chrysler, Ford, and Nissan compatible)\u003c\/li\u003e\n\u003cli\u003eTwo-nozzle progressive nitrous oxide control, 8 stages, by time, RPM, or boost (requires part 554-111)\u003c\/li\u003e\n\u003cli\u003eLean or rich safety cutoff\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, compatible with 1- or 2-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eOnboard data logger with smoothing, multiple graph views, and notes fields; 4 GB internal memory\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy with fuel map smoothing\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control with configurable timing retard per stage\u003c\/li\u003e\n\u003cli\u003eOptional digital displays: 7\" Digital Dash (553-106) or 3.5\" Touch Screen LCD (553-108)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS2\/LS3\/LS7 (58x crank, 4x cam)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV1\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E, 4L80E\u003c\/li\u003e\n\u003cli\u003eThrottle Control: Drive-by-wire (DBW)\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eMAP Sensor Range: 1-7 Bar\u003c\/li\u003e\n\u003cli\u003eECU Dimensions: 13.14\" length x 6.10\" width, height variable 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eCertification: ISO 8846, SAE J1171 \u0026amp; U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-660\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDominator EFI systems are sold à la carte — a complete system requires the ECU, main power harness, wideband oxygen sensor, engine main harness, injector harness, ignition adapter harness, and accessories, each purchased separately as needed. If running a transbrake, Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eGM LS2\/LS3\/LS7 engines (58x crank, 4x cam, 4.8\/5.3\/6.0-style) running EV1 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit control the transmission and throttle body?\u003c\/h5\u003e\u003cp\u003eYes — it includes integrated electronic control for GM 4L60E\/4L80E transmissions and drive-by-wire throttle body control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eDoes this system support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\u003c\/p\u003e\u003ch5\u003eDo I need anything else to run this on a transbrake car?\u003c\/h5\u003e\u003cp\u003eYes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch5\u003eIs this a complete standalone EFI system by itself?\u003c\/h5\u003e\u003cp\u003eDominator EFI is sold à la carte. This kit provides the ECU, main harness, injector harness, and wideband sensor — additional accessories like a digital dash are purchased separately depending on your build.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS2\/LS3\/LS7 engines (58x crank, 4x cam, 4.8\/5.3\/6.0-style) running EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit control the transmission and throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes - it includes integrated electronic control for GM 4L60E\/4L80E transmissions and drive-by-wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to run this on a transbrake car?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes - Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}},{\"@type\":\"Question\",\"name\":\"Is this a complete standalone EFI system by itself?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator EFI is sold a la carte. This kit provides the ECU, main harness, injector harness, and wideband sensor - additional accessories like a digital dash are purchased separately depending on your build.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418620203056,"sku":"GVMR_550-660","price":3699.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_55eab978-9b7c-4e71-a17a-16812a5f8c81.png?v=1758388122"},{"product_id":"dominator-efi-kit-ls2-main-harness-w-trans-control-with-ev1-injector-harness-550-658","title":"Holley Dominator EFI Kit, LS2 Main Harness with Trans Control, EV1 Injector Harness | 550-658","description":"\u003cp\u003eDominator EFI Vehicle Management Systems are built for non-emissions street and racing engines, with transmission control, drive-by-wire, and dual wideband oxygen sensor options that give the ECU nearly unlimited capability to control any power adder, input, or output. This kit provides the main harness for GM LS2\/LS3\/LS7 (58x crank, 4x cam, 4.8\/5.3\/6.0-style) engines running EV1 injectors and a 4L60E\/4L80E transmission.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIntegrated drive-by-wire throttle body control for two DBW throttle bodies (GM, Chrysler, Ford, and Nissan compatible)\u003c\/li\u003e\n\u003cli\u003eTwo-nozzle progressive nitrous oxide control, 8 stages, by time, RPM, or boost (requires part 554-111)\u003c\/li\u003e\n\u003cli\u003eSealed automotive and marine-grade connectors\u003c\/li\u003e\n\u003cli\u003eProgressive nitrous control, requires part 554-111\u003c\/li\u003e\n\u003cli\u003eSelf-tuning fuel table strategy — the more you drive it, the more it learns\u003c\/li\u003e\n\u003cli\u003eOnboard data logger with smoothing, multiple graph views, and notes fields\u003c\/li\u003e\n\u003cli\u003e1-7 Bar MAP sensor capability for naturally aspirated or boosted applications\u003c\/li\u003e\n\u003cli\u003eTwo-channel knock control, compatible with 1- or 2-wire knock sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated electronic transmission control for GM 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eIndividual cylinder fuel and spark control\u003c\/li\u003e\n\u003cli\u003eECU is fully potted and can be mounted in the engine bay or interior\u003c\/li\u003e\n\u003cli\u003eFully featured turbocharger boost control with configurable timing retard per stage\u003c\/li\u003e\n\u003cli\u003eOptional digital displays: 7\" Digital Dash (553-106) or 3.5\" Touch Screen LCD (553-108)\u003c\/li\u003e\n\u003cli\u003eRacepak Integration Module available\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS2\/LS3\/LS7 (58x crank, 4x cam)\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV1\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E, 4L80E\u003c\/li\u003e\n\u003cli\u003eKit Includes: Dominator ECU, USB cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, ECU mounting hardware\u003c\/li\u003e\n\u003cli\u003eMAP Sensor Range: 1-7 Bar\u003c\/li\u003e\n\u003cli\u003eECU Dimensions: 13.14\" length x 6.10\" width, height variable 1.00\"-1.84\"\u003c\/li\u003e\n\u003cli\u003eMounting Bolt Pattern: 12.13\" x 6.10\"\u003c\/li\u003e\n\u003cli\u003eCertification: ISO 8846, SAE J1171 \u0026amp; U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-658\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDominator EFI systems are sold à la carte — a complete system requires the ECU, main power harness, wideband oxygen sensor, engine main harness, injector harness, ignition adapter harness, and accessories, each purchased separately as needed. If running a transbrake, Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does this harness kit fit?\u003c\/h5\u003e\u003cp\u003eGM LS2\/LS3\/LS7 engines (58x crank, 4x cam, 4.8\/5.3\/6.0-style) running EV1 injectors.\u003c\/p\u003e\u003ch5\u003eHow does this differ from the DBW version (550-660)?\u003c\/h5\u003e\u003cp\u003eThis kit includes transmission control for GM 4L60E\/4L80E but does not include drive-by-wire throttle body control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the kit?\u003c\/h5\u003e\u003cp\u003eThe Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\u003c\/p\u003e\u003ch5\u003eDoes this system support boost or nitrous control?\u003c\/h5\u003e\u003cp\u003eYes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\u003c\/p\u003e\u003ch5\u003eDo I need anything else to run this on a transbrake car?\u003c\/h5\u003e\u003cp\u003eYes — Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does this harness kit fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS2\/LS3\/LS7 engines (58x crank, 4x cam, 4.8\/5.3\/6.0-style) running EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"How does this differ from the DBW version (550-660)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This kit includes transmission control for GM 4L60E\/4L80E but does not include drive-by-wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Dominator ECU, USB programming cable, ECU power harness, engine main harness, EV1 injector harness, Bosch wideband oxygen sensor, and ECU mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support boost or nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes fully featured turbocharger boost control and 8-stage progressive nitrous oxide control (nitrous staging requires part 554-111).\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to run this on a transbrake car?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes - Holley requires a relay or its Transbrake input protection device (P\/N 554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418620268592,"sku":"GVMR_550-658","price":3599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_e9a28e3d-e0d3-4f8b-887d-b82bc82f4f06.png?v=1758388129"},{"product_id":"dominator-efi-kit-universal-main-harness-with-ev1-injector-harness-550-652","title":"Holley Dominator EFI Kit, Universal Main Harness with EV1 Injector Harness | 550-652","description":"\u003cp\u003eHolley's Dominator EFI Vehicle Management System is built for non-emissions street and race engines, with optional transmission control, drive-by-wire throttle control, and dual wideband oxygen sensor inputs, giving the Dominator ECU nearly unlimited capability to control turbochargers, nitrous, water-methanol injection, and other power adders as its own data acquisition and control module. This kit supplies the universal main engine harness for domestic V8s — conventional push-rod Chevrolet and Chrysler engines — using EV1-style injectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine application: Chevrolet Small and Big Block, Chrysler Small Block\u003c\/li\u003e\n\u003cli\u003eInjector connector type: EV1\u003c\/li\u003e\n\u003cli\u003eHarness scope: Main engine harness only — Dominator ECU, power harness, wideband oxygen sensor, injector harness, ignition adapter harness, and accessories are sold separately\u003c\/li\u003e\n\u003cli\u003eCertifications: ISO 8846, SAE J1171, and U.S. Coast Guard ignition protection and fire resistance requirements\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-652\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhen using a transbrake, a relay or Holley's Transbrake input protection device (554-128) is required to protect the ECU from flyback voltage.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this harness include the ECU?\u003c\/h5\u003e\u003cp\u003eNo — Dominator EFI systems are sold a la carte. This listing is the main engine harness only; the ECU, power harness, wideband sensor, injector harness, and ignition adapter harness are purchased separately.\u003c\/p\u003e\u003ch5\u003eWhat injector connector does this harness use?\u003c\/h5\u003e\u003cp\u003eEV1-style injector connectors.\u003c\/p\u003e\u003ch5\u003eWhat engines is this harness designed for?\u003c\/h5\u003e\u003cp\u003eDomestic V8s, including conventional push-rod Chevrolet small and big block and Chrysler small block engines.\u003c\/p\u003e\u003ch5\u003eDo I need extra protection if I'm running a transbrake?\u003c\/h5\u003e\u003cp\u003eYes — install a relay or Holley's Transbrake input protection device (554-128) to protect the ECU from flyback voltage when the transbrake releases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this harness include the ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — Dominator EFI systems are sold a la carte. This listing is the main engine harness only; the ECU, power harness, wideband sensor, injector harness, and ignition adapter harness are purchased separately.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector does this harness use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"EV1-style injector connectors.\"}},{\"@type\":\"Question\",\"name\":\"What engines is this harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Domestic V8s, including conventional push-rod Chevrolet small and big block and Chrysler small block engines.\"}},{\"@type\":\"Question\",\"name\":\"Do I need extra protection if I'm running a transbrake?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — install a relay or Holley's Transbrake input protection device (554-128) to protect the ECU from flyback voltage when the transbrake releases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418620596272,"sku":"GVMR_550-652","price":3299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/boost_6dcb42a5-ef3c-43bb-a21c-445cf4ffc689.png?v=1758388168"},{"product_id":"for-different-throttle-bodies-520-1","title":"Holley Sniper EFI Installation Kit, Universal Throttle Body Mounting Hardware | 520-1","description":"\u003cp\u003eThis Sniper EFI installation kit bundles the common mechanical and electrical hardware needed to mount a Sniper EFI throttle body to a variety of engine platforms, helping avoid leaks or wiring errors during the swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eContents: (4) Throttle linkage studs\u003c\/li\u003e\n\u003cli\u003eContents: (4) Carburetor studs and nuts\u003c\/li\u003e\n\u003cli\u003eContents: (1) 4150-pattern base gasket\u003c\/li\u003e\n\u003cli\u003eContents: (1) 2300-pattern base gasket\u003c\/li\u003e\n\u003cli\u003eContents: (1) Universal air cleaner stud\u003c\/li\u003e\n\u003cli\u003eContents: (1) Air cleaner gasket\u003c\/li\u003e\n\u003cli\u003eContents: Assorted wire connectors, terminals, and zip ties\u003c\/li\u003e\n\u003cli\u003ePart Number: 520-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's included in this kit?\u003c\/h5\u003e\u003cp\u003eThrottle linkage studs, carburetor studs and nuts, 4150 and 2300-pattern base gaskets, a universal air cleaner stud and gasket, and assorted wire connectors, terminals, and zip ties.\u003c\/p\u003e\u003ch5\u003eWhat is this kit used for?\u003c\/h5\u003e\u003cp\u003eIt provides the common mechanical and electrical hardware needed when installing a Sniper EFI throttle body system, covering a wide range of vehicle applications.\u003c\/p\u003e\u003ch5\u003eDoes this kit fit a specific throttle body?\u003c\/h5\u003e\u003cp\u003eNo. It's a universal installation kit designed to work across the common Sniper EFI throttle body mounting patterns, including 4150 and 2300 base gaskets.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included in this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Throttle linkage studs, carburetor studs and nuts, 4150 and 2300-pattern base gaskets, a universal air cleaner stud and gasket, and assorted wire connectors, terminals, and zip ties.\"}},{\"@type\":\"Question\",\"name\":\"What is this kit used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It provides the common mechanical and electrical hardware needed when installing a Sniper EFI throttle body system, covering a wide range of vehicle applications.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit fit a specific throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's a universal installation kit designed to work across the common Sniper EFI throttle body mounting patterns, including 4150 and 2300 base gaskets.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478730706992,"sku":"FRCQ_520-1","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/520-1_0118143.jpg?v=1760318792"},{"product_id":"external-fuel-pressure-regulator-fittings-hose-550-510-3ae","title":"Holley Sniper 2 EFI Upgrade Kit, Polished, External Regulator\/Fittings\/Hose, 3.5\" Handheld | 550-510-3AE","description":"\u003cp\u003eThis Sniper 2 EFI upgrade kit lets owners of the original Sniper EFI system move up to Sniper 2 without rewiring their vehicle. Simply remove the original Sniper throttle body, unplug the connectors, install the polished Sniper 2 throttle body, and plug the included adapter harness into the existing main harness. The \"AE\" configuration adds an adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay, plus a 3.5\" full-color handheld display for setup and monitoring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play upgrade path from original Sniper EFI to Sniper 2 in under an hour, no rewiring required\u003c\/li\u003e\n\u003cli\u003eIncludes an adjustable external fuel pressure regulator, AN fittings, and a 3-foot fuel hose for engine-bay mounting\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eReuses the existing coolant temperature sensor and wideband oxygen sensor from the original Sniper install\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance against old wiring, noisy alternators, and faulty plug wires\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eCalibration wizard only requires answering a few simple questions about the engine to build a base map and begin self-tuning, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition, fuel systems, and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI (adjustable external regulator included)\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 9\/16-18 Female O-Ring (AN 6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3AE\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned specifically as a plug-and-play upgrade for an existing Sniper EFI installation; the original wiring harness stays in place.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the \"AE\" kit include that the base upgrade kit doesn't?\u003c\/h5\u003e\u003cp\u003eIt adds an adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay.\u003c\/p\u003e\u003ch5\u003eDo I need to rewire my vehicle to install this upgrade?\u003c\/h5\u003e\u003cp\u003eNo. It plugs into the existing Sniper EFI wiring harness through an included adapter, so the original harness stays in place.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 3.5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction, using four 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a fuel pump?\u003c\/h5\u003e\u003cp\u003eNo. This is a throttle body and regulator upgrade kit; it does not include a fuel pump.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the \\\"AE\\\" kit include that the base upgrade kit doesn't?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adds an adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to rewire my vehicle to install this upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It plugs into the existing Sniper EFI wiring harness through an included adapter, so the original harness stays in place.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 3.5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction, using four 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This is a throttle body and regulator upgrade kit; it does not include a fuel pump.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478770815024,"sku":"FRCQ_550-510-3AE","price":1349.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/5ac4e6d48b3c5ff54aea3e4883dbee5b12fc5b42.jpg?v=1760321548"},{"product_id":"holley-sniper-2-efi-polished-550-510-3ax","title":"Holley Sniper 2 EFI Base Kit, Polished, 3.5\" Handheld, 650 HP | 550-510-3AX","description":"\u003cp\u003eThis Sniper 2 EFI base upgrade kit lets owners of the original Sniper EFI system move up to Sniper 2 without rewiring their vehicle. Simply remove the original Sniper throttle body, unplug the connectors, install the polished Sniper 2 throttle body, and plug the included adapter harness into the existing main harness. This base configuration includes the throttle body and a 3.5\" full-color handheld display; a fuel pressure regulator and fuel pump are not included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play upgrade path from original Sniper EFI to Sniper 2 in under an hour, no rewiring required\u003c\/li\u003e\n\u003cli\u003eSupports up to 650 hp naturally aspirated or 575 hp boosted with four 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eReuses the existing coolant temperature sensor and wideband oxygen sensor from the original Sniper install\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eCalibration wizard only requires answering a few simple questions about the engine to build a base map, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition, fuel systems, and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eFuel Pressure Regulator: Not included\u003c\/li\u003e\n\u003cli\u003eFuel System: Not included\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 9\/16-18 Female O-Ring (AN 6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3AX\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA separate fuel pressure regulator and fuel delivery system are required to complete this installation and are sold separately.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's included in this base upgrade kit?\u003c\/h5\u003e\u003cp\u003eThe polished Sniper 2 throttle body and a 3.5\" handheld display. A fuel pressure regulator and fuel system are not included.\u003c\/p\u003e\u003ch5\u003eDo I need to rewire my vehicle to install this upgrade?\u003c\/h5\u003e\u003cp\u003eNo. It plugs into the existing Sniper EFI wiring harness through an included adapter.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 3.5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eDo I need anything else to complete this installation?\u003c\/h5\u003e\u003cp\u003eYes. A fuel pressure regulator and compatible fuel delivery system are required and sold separately.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included in this base upgrade kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The polished Sniper 2 throttle body and a 3.5\\\" handheld display. A fuel pressure regulator and fuel system are not included.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to rewire my vehicle to install this upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It plugs into the existing Sniper EFI wiring harness through an included adapter.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 3.5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to complete this installation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. A fuel pressure regulator and compatible fuel delivery system are required and sold separately.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478770880560,"sku":"FRCQ_550-510-3AX","price":1249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/144d040ac5bbce79c35ad1290956717807a1bc51.jpg?v=1760321557"},{"product_id":"returnless-style-drop-in-module-with-pdm-3-5-in-handheld-550-510-3pd","title":"Holley Sniper 2 EFI Returnless Drop-In Module, With PDM, 3.5\" Handheld | 550-510-3PD","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with a returnless-style in-tank drop-in fuel module, built for classics running a returnless fuel system. The optional Power Distribution Module (PDM) isolates the core EFI and ignition wiring into one location: slide the stripped wire ends under the positive-lock connector, tighten the set screw, and only battery power and a switched 12-volt source are required. 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installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eUser-friendly setup wizard builds a base tune from a few simple engine questions, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Universal Returnless Drop-In Module\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 340 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PD\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is a returnless drop-in fuel module?\u003c\/h5\u003e\u003cp\u003eIt's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM do?\u003c\/h5\u003e\u003cp\u003eThe Power Distribution Module isolates the core EFI and ignition wiring into one location, reducing the vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 3.5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to tune this system?\u003c\/h5\u003e\u003cp\u003eNo. The handheld's setup wizard builds a base tune from a few simple engine questions and the system self-tunes from there.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a returnless drop-in fuel module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Power Distribution Module isolates the core EFI and ignition wiring into one location, reducing the vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 3.5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to tune this system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The handheld's setup wizard builds a base tune from a few simple engine questions and the system self-tunes from there.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478770946096,"sku":"FRCQ_550-510-3PD","price":2199.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/d07e2a1a8d3df3554999a935d7bbbadeb1da83e0.jpg?v=1760321565"},{"product_id":"inline-pump-with-pdm-3-5-in-handheld-550-510-3pk","title":"Holley Sniper 2 EFI Inline Pump Master Kit, With PDM, 3.5\" Handheld, 240 LPH | 550-510-3PK","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with a 240 LPH inline fuel pump, a genuine Bosch LSU 4.9 wideband oxygen sensor, and the optional Power Distribution Module (PDM) for simplified wiring, plus a 3.5\" full-color handheld display. It's built for vehicles that don't already have an in-tank pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003e240 LPH inline fuel pump master kit for vehicles without an existing in-tank pump\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit, stainless T-bolt clamps, and a stainless weldable flange for a leak-free install\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module (PDM) simplifies wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eMain harness includes plug-and-play HyperSpark distributor support for integrated timing control\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (CD box or MSD Pro Billet\/crank trigger to Sniper 2)\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Inline Master Kit\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 240 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PK\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat fuel pump comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eCan I run this with a HyperSpark ignition?\u003c\/h5\u003e\u003cp\u003eYes. The main harness includes plug-and-play HyperSpark distributor support for integrated timing control.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What fuel pump comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM simplify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Can I run this with a HyperSpark ignition?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The main harness includes plug-and-play HyperSpark distributor support for integrated timing control.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771011632,"sku":"FRCQ_550-510-3PK","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/ec477b1c5b6d75e29f2905ca0fe7bcd1c1a3daf7.jpg?v=1760321574"},{"product_id":"sniper-2-efi-bundle-with-hyperspark-ignition-system-550-510-3pk-sbc","title":"Holley Sniper 2 EFI Bundle w\/ HyperSpark Ignition, Chevy Big\/Small Block, PDM, 3.5\" Handheld | 550-510-3PK-SBC","description":"\u003cp\u003eThis is Holley's most complete Sniper 2 conversion package, bundling the self-tuning Sniper 2 throttle body, a 240 LPH inline fuel pump master kit, the Power Distribution Module (PDM), and a HyperSpark ignition system with a Chevrolet distributor, coil, and ignition box, plus a 3.5\" full-color handheld display. It's built for small block or big block Chevrolet engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBundle includes PDM, HyperSpark 2 ignition box, coil, and a Chevrolet big block or small block distributor\u003c\/li\u003e\n\u003cli\u003eBillet aluminum distributor plugs directly into the main harness and uses a Hall Effect crank trigger for a noise-free RPM signal\u003c\/li\u003e\n\u003cli\u003ePatented clear installation cap eliminates confusion when setting distributor timing marks\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition coil bracket delivers up to 150 mJ of spark energy per second from idle to redline\u003c\/li\u003e\n\u003cli\u003eIgnition box keeps the features of its predecessor in a smaller, lighter housing for a cleaner install and consistent spark energy\u003c\/li\u003e\n\u003cli\u003eSniper 2 Bluetooth module option turns a smartphone into a tuning and monitoring interface\u003c\/li\u003e\n\u003cli\u003e240 LPH inline fuel pump master kit included\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003ePDM reduces vehicle-side wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6 (Sniper 2 Transmission Control Kit and vehicle-specific harnesses sold separately)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eDistributor Included: Chevrolet Big\/Small Block\u003c\/li\u003e\n\u003cli\u003eHyperSpark Ignition Kit: Chevrolet Big\/Small Block\u003c\/li\u003e\n\u003cli\u003eFuel System: Inline Master Kit\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 240 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished \/ Aluminum\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PK-SBC\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat ignition components are included in this bundle?\u003c\/h5\u003e\u003cp\u003eA HyperSpark 2 ignition box, coil, and a Chevrolet big block\/small block distributor with a billet aluminum housing and Hall Effect crank trigger.\u003c\/p\u003e\u003ch5\u003eWhat Chevrolet engines does this fit?\u003c\/h5\u003e\u003cp\u003eChevrolet big block and small block engines using the HyperSpark distributor included in this kit.\u003c\/p\u003e\u003ch5\u003eDoes this bundle include a fuel pump?\u003c\/h5\u003e\u003cp\u003eYes, a 240 LPH inline fuel pump master kit is included.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eDoes this system support nitrous control?\u003c\/h5\u003e\u003cp\u003eNo. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What ignition components are included in this bundle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A HyperSpark 2 ignition box, coil, and a Chevrolet big block\/small block distributor with a billet aluminum housing and Hall Effect crank trigger.\"}},{\"@type\":\"Question\",\"name\":\"What Chevrolet engines does this fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Chevrolet big block and small block engines using the HyperSpark distributor included in this kit.\"}},{\"@type\":\"Question\",\"name\":\"Does this bundle include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 240 LPH inline fuel 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3.5\" Handheld | 550-510-3PK-SBF","description":"\u003cp\u003eThis is Holley's most complete Sniper 2 conversion package, bundling the self-tuning Sniper 2 throttle body, a 240 LPH inline fuel pump master kit, the Power Distribution Module (PDM), and a HyperSpark ignition system with a Ford distributor, coil, and ignition box, plus a 3.5\" full-color handheld display. It's built for 8.2\" deck Ford small block engines (260\/289\/302\/5.0L V8).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBundle includes PDM, HyperSpark 2 ignition box, coil, and a Ford small block distributor\u003c\/li\u003e\n\u003cli\u003eBillet aluminum distributor plugs directly into the main harness and uses a Hall Effect crank trigger for a noise-free RPM signal\u003c\/li\u003e\n\u003cli\u003ePatented clear installation cap eliminates confusion when setting distributor timing marks\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition coil bracket delivers up to 150 mJ of spark energy per second from idle to redline\u003c\/li\u003e\n\u003cli\u003eIgnition box keeps the features of its predecessor in a smaller, lighter housing for a cleaner install and consistent spark energy\u003c\/li\u003e\n\u003cli\u003eSniper 2 Bluetooth module option turns a smartphone into a tuning and monitoring interface\u003c\/li\u003e\n\u003cli\u003e240 LPH inline fuel pump master kit included\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003ePDM reduces vehicle-side wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6 (Sniper 2 Transmission Control Kit and vehicle-specific harnesses sold separately)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eDistributor Included: Ford Small Block\u003c\/li\u003e\n\u003cli\u003eHyperSpark Ignition Kit: Ford Small Block, 8.2\" Deck\u003c\/li\u003e\n\u003cli\u003eFuel System: Inline Master Kit\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 240 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished \/ Aluminum\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PK-SBF\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFits Ford 260\/289\/302\/5.0L V8 engines only. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Ford engines does this bundle fit?\u003c\/h5\u003e\u003cp\u003e8.2\" deck Ford small block V8 engines: 260, 289, 302, and 5.0L.\u003c\/p\u003e\u003ch5\u003eWhat ignition components are included?\u003c\/h5\u003e\u003cp\u003eA HyperSpark 2 ignition box, coil, and a Ford small block distributor with a billet aluminum housing and Hall Effect crank trigger.\u003c\/p\u003e\u003ch5\u003eDoes this bundle include a fuel pump?\u003c\/h5\u003e\u003cp\u003eYes, a 240 LPH inline fuel pump master kit is included.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eDoes this system support nitrous control?\u003c\/h5\u003e\u003cp\u003eNo. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Ford engines does this bundle fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"8.2\\\" deck Ford small block V8 engines: 260, 289, 302, and 5.0L.\"}},{\"@type\":\"Question\",\"name\":\"What ignition components are included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A HyperSpark 2 ignition box, coil, and a Ford small block distributor with a billet aluminum housing and Hall Effect crank trigger.\"}},{\"@type\":\"Question\",\"name\":\"Does this bundle include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 240 LPH inline fuel pump master kit is included.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM simplify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Nitrous control is not supported in the Sniper 2 EFI software.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771142704,"sku":"FRCQ_550-510-3PK-SBF","price":2599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-510-3PK-SBF_01.jpg?v=1760321590"},{"product_id":"return-style-drop-in-module-with-pdm-3-5-in-handheld-550-510-3pr","title":"Holley Sniper 2 EFI Return-Style Drop-In Module, With PDM, 3.5\" Handheld | 550-510-3PR","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with a return-style in-tank drop-in fuel module, built for classics running a traditional return-style fuel system. The optional Power Distribution Module (PDM) isolates the core EFI and ignition wiring into one location: slide the stripped wire ends under the positive-lock connector, tighten the set screw, and only battery power and a switched 12-volt source are required. A 3.5\" full-color handheld display handles setup and tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003eReturn-style drop-in fuel module built for in-tank installation on return-style fuel systems\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module (PDM) simplifies wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eUser-friendly setup wizard builds a base tune from a few simple engine questions, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Universal Drop-In Module (Return Style)\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 340 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PR\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is a return-style drop-in fuel module?\u003c\/h5\u003e\u003cp\u003eIt's an in-tank fuel module designed for vehicles running a traditional return-style fuel system, where excess fuel is routed back to the tank.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM do?\u003c\/h5\u003e\u003cp\u003eThe Power Distribution Module isolates the core EFI and ignition wiring into one location, reducing vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 3.5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to tune this system?\u003c\/h5\u003e\u003cp\u003eNo. The handheld's setup wizard builds a base tune from a few simple engine questions and the system self-tunes from there.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a return-style drop-in fuel module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an in-tank fuel module designed for vehicles running a traditional return-style fuel system, where excess fuel is routed back to the tank.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Power Distribution Module isolates the core EFI and ignition wiring into one location, reducing vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 3.5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to tune this system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The handheld's setup wizard builds a base tune from a few simple engine questions and the system self-tunes from there.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771208240,"sku":"FRCQ_550-510-3PR","price":2199.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/e93cb10020b84d0b2451e54bb5e58a16281c8237.jpg?v=1760321599"},{"product_id":"base-kit-with-pdm-3-5-in-handheld-550-510-3px","title":"Holley Sniper 2 EFI Base Kit, 4150 Flange, 800 CFM, PDM, 3.5\" Handheld | 550-510-3PX","description":"\u003cp\u003eSniper 2 EFI is Holley's self-tuning fuel injection conversion for classic 4150-flange carbureted engines, built to bolt on in place of a 4-barrel carburetor and deliver modern cold starts, drivability, and fuel economy. A guided setup wizard walks through a few questions about the engine and the system begins self-tuning from there — no laptop or tuning experience required. This configuration includes the optional Power Distribution Module (PDM), which consolidates the core EFI and ignition wiring into a single connection point, and pairs with the 3.5\" handheld for setup, tuning, and gauge display.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSelf-tuning ECU with a calibration wizard that builds a base map from a few engine questions — no laptop required\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for real-time fuel map learning\u003c\/li\u003e\n\u003cli\u003eOptional Power Distribution Module (PDM) consolidates EFI and ignition wiring into one connector\u003c\/li\u003e\n\u003cli\u003eOnboard contactless magnetic TPS sensor for accurate throttle position readings\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kickdown provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003ePlug-and-play HyperSpark distributor support built into the main harness for integrated timing control\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover between primary and secondary fuel rails\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, RPM\u003c\/li\u003e\n\u003cli\u003eCompatible with the Sniper EFI ecosystem: HyperSpark ignition, fuel systems, and multiple gauge\/display options\u003c\/li\u003e\n\u003cli\u003eChoice of tuning interfaces: 3.5\" handheld, 5\" digital dash, or Bluetooth dongle for iOS\/Android\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector and throttle shaft\/plate geometry for improved reliability and throttle feel\u003c\/li\u003e\n\u003cli\u003eClamp-on oxygen sensor kit with stainless steel T-bolt clamps and weldable O2 flange included\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU with improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eEach throttle body is individually serialized for warranty and service tracking\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (558-329 CD Box to Sniper 2, 558-330 MSD Pro-Billet\/Crank Trigger to Sniper 2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eMax Horsepower: 650 naturally aspirated, 575 on boost with four 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eFuel System: Not included with this kit\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2-bar\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Included\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" handheld\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 9\/16-18 female O-ring (AN 6)\u003c\/li\u003e\n\u003cli\u003eFinish: Shiny\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All (kickdown provisions for GM TH350\/400, 200-4R\/700R4, Ford C4\/C6)\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-year standard, extended with product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PX\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNitrous control is not supported in the Sniper 2 EFI software. A separate complete fuel system (hose, pump, regulator, filters, and bulkhead fitting) is available and sold separately for this kit.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes the 550-510-3PX include a fuel system?\u003c\/h5\u003e\u003cp\u003eNo, this kit does not include a fuel system — hose, pump, and regulator are sold separately as a complete fuel system kit.\u003c\/p\u003e\u003ch5\u003eWhat horsepower does this kit support?\u003c\/h5\u003e\u003cp\u003eUp to 650 HP naturally aspirated, or 575 HP on boost with the included four 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes Sniper 2 support nitrous control?\u003c\/h5\u003e\u003cp\u003eNo, nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch5\u003eWhat is the Power Distribution Module (PDM)?\u003c\/h5\u003e\u003cp\u003eAn optional accessory included with this kit that consolidates the core EFI and ignition wiring into a single, easy-to-use connection point.\u003c\/p\u003e\u003ch5\u003eDo I need a laptop to tune this system?\u003c\/h5\u003e\u003cp\u003eNo. The calibration wizard on the 3.5\" handheld asks a few questions about the engine and builds a base tune, then the system self-tunes from there.\u003c\/p\u003e\u003ch5\u003eWhat transmissions does this kit support kickdown for?\u003c\/h5\u003e\u003cp\u003eGM TH350\/400 and 200-4R\/700R4, plus Ford C4\/C6.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the 550-510-3PX include a fuel system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit does not include a fuel system, hose, pump, and regulator are sold separately as a complete fuel system kit.\"}},{\"@type\":\"Question\",\"name\":\"What horsepower does this kit support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 HP naturally aspirated, or 575 HP on boost with the included four 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does Sniper 2 support nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, nitrous control is not supported in the Sniper 2 EFI software.\"}},{\"@type\":\"Question\",\"name\":\"What is the Power Distribution Module (PDM)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An optional accessory included with this kit that consolidates the core EFI and ignition wiring into a single, easy-to-use connection point.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a laptop to tune this system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The calibration wizard on the 3.5-inch handheld asks a few questions about the engine and builds a base tune, then the system self-tunes from there.\"}},{\"@type\":\"Question\",\"name\":\"What transmissions does this kit support kickdown for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM TH350\/400 and 200-4R\/700R4, plus Ford C4\/C6.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771306544,"sku":"FRCQ_550-510-3PX","price":1599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/d022f86c0d596e475e191a953a85133bded90ee0.jpg?v=1760321607"},{"product_id":"sniper-2-efi-bundle-with-hyperspark-ignition-system-550-510-3px-sbc","title":"Holley Sniper 2 EFI Bundle w\/ HyperSpark Ignition, Chevy Big\/Small Block, PDM, 3.5\" Handheld | 550-510-3PX-SBC","description":"\u003cp\u003eThis Sniper 2 conversion bundle pairs the self-tuning Sniper 2 throttle body, the Power Distribution Module (PDM), and a HyperSpark ignition system with a Chevrolet distributor, coil, and ignition box, plus a 3.5\" full-color handheld display. It's built for small block or big block Chevrolet engines. A fuel delivery system is not included and should be sourced separately or paired with an existing in-tank pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBundle includes PDM, HyperSpark 2 ignition box, coil, and a Chevrolet big block or small block distributor\u003c\/li\u003e\n\u003cli\u003eBillet aluminum distributor plugs directly into the main harness and uses a Hall Effect crank trigger for a noise-free RPM signal\u003c\/li\u003e\n\u003cli\u003ePatented clear installation cap eliminates confusion when setting distributor timing marks\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition coil bracket delivers up to 150 mJ of spark energy per second from idle to redline\u003c\/li\u003e\n\u003cli\u003eIgnition box keeps the features of its predecessor in a smaller, lighter housing for a cleaner install and consistent spark energy\u003c\/li\u003e\n\u003cli\u003eSniper 2 Bluetooth module option turns a smartphone into a tuning and monitoring interface\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003ePDM reduces vehicle-side wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6 (Sniper 2 Transmission Control Kit and vehicle-specific harnesses sold separately)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eDistributor Included: Chevrolet Big\/Small Block\u003c\/li\u003e\n\u003cli\u003eHyperSpark Ignition Kit: Chevrolet Big\/Small Block\u003c\/li\u003e\n\u003cli\u003eFuel System: Not included\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished \/ Aluminum\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PX-SBC\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA fuel pump and delivery system are not included and must be sourced separately. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes this bundle include a fuel pump?\u003c\/h5\u003e\u003cp\u003eNo. This configuration includes the throttle body, PDM, and HyperSpark ignition, but not a fuel delivery system.\u003c\/p\u003e\u003ch5\u003eWhat ignition components are included?\u003c\/h5\u003e\u003cp\u003eA HyperSpark 2 ignition box, coil, and a Chevrolet big block\/small block distributor with a billet aluminum housing and Hall Effect crank trigger.\u003c\/p\u003e\u003ch5\u003eWhat Chevrolet engines does this fit?\u003c\/h5\u003e\u003cp\u003eChevrolet big block and small block engines using the HyperSpark distributor included in this kit.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eDoes this system support nitrous control?\u003c\/h5\u003e\u003cp\u003eNo. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this bundle include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This configuration includes the throttle body, PDM, and HyperSpark ignition, but not a fuel delivery system.\"}},{\"@type\":\"Question\",\"name\":\"What ignition components are included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A HyperSpark 2 ignition box, coil, and a Chevrolet big block\/small block distributor with a billet aluminum housing and Hall Effect crank trigger.\"}},{\"@type\":\"Question\",\"name\":\"What Chevrolet engines does this fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Chevrolet big block and small block engines using the HyperSpark distributor included in this kit.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM simplify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Nitrous control is not supported in the Sniper 2 EFI software.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771372080,"sku":"FRCQ_550-510-3PX-SBC","price":2149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-510-3PX-SBC_01.jpg?v=1760321615"},{"product_id":"sniper-2-efi-bundle-with-hyperspark-ignition-system-550-510-3px-sbf","title":"Holley Sniper 2 EFI Bundle w\/ HyperSpark Ignition, Ford Small Block, PDM, 3.5\" Handheld | 550-510-3PX-SBF","description":"\u003cp\u003eThis Sniper 2 conversion bundle pairs the self-tuning Sniper 2 throttle body, the Power Distribution Module (PDM), and a HyperSpark ignition system with a Ford distributor, coil, and ignition box, plus a 3.5\" full-color handheld display. It's built for 8.2\" deck Ford small block engines (260\/289\/302\/5.0L V8). A fuel delivery system is not included and should be sourced separately or paired with an existing in-tank pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBundle includes PDM, HyperSpark 2 ignition box, coil, and a Ford small block distributor\u003c\/li\u003e\n\u003cli\u003eBillet aluminum distributor plugs directly into the main harness and uses a Hall Effect crank trigger for a noise-free RPM signal\u003c\/li\u003e\n\u003cli\u003ePatented clear installation cap eliminates confusion when setting distributor timing marks\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition coil bracket delivers up to 150 mJ of spark energy per second from idle to redline\u003c\/li\u003e\n\u003cli\u003eIgnition box keeps the features of its predecessor in a smaller, lighter housing for a cleaner install and consistent spark energy\u003c\/li\u003e\n\u003cli\u003eSniper 2 Bluetooth module option turns a smartphone into a tuning and monitoring interface\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003ePDM reduces vehicle-side wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6 (Sniper 2 Transmission Control Kit and vehicle-specific harnesses sold separately)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eDistributor Included: Ford Small Block\u003c\/li\u003e\n\u003cli\u003eHyperSpark Ignition Kit: Ford Small Block, 8.2\" Deck\u003c\/li\u003e\n\u003cli\u003eFuel System: Not included\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished \/ Aluminum\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3PX-SBF\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFits Ford 260\/289\/302\/5.0L V8 engines only. A fuel pump and delivery system are not included and must be sourced separately. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Ford engines does this bundle fit?\u003c\/h5\u003e\u003cp\u003e8.2\" deck Ford small block V8 engines: 260, 289, 302, and 5.0L.\u003c\/p\u003e\u003ch5\u003eDoes this bundle include a fuel pump?\u003c\/h5\u003e\u003cp\u003eNo. This configuration includes the throttle body, PDM, and HyperSpark ignition, but not a fuel delivery system.\u003c\/p\u003e\u003ch5\u003eWhat ignition components are included?\u003c\/h5\u003e\u003cp\u003eA HyperSpark 2 ignition box, coil, and a Ford small block distributor with a billet aluminum housing and Hall Effect crank trigger.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eDoes this system support nitrous control?\u003c\/h5\u003e\u003cp\u003eNo. Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Ford engines does this bundle fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"8.2\\\" deck Ford small block V8 engines: 260, 289, 302, and 5.0L.\"}},{\"@type\":\"Question\",\"name\":\"Does this bundle include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This configuration includes the throttle body, PDM, and HyperSpark ignition, but not a fuel delivery system.\"}},{\"@type\":\"Question\",\"name\":\"What ignition components are included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A HyperSpark 2 ignition box, coil, and a Ford small block distributor with a billet aluminum housing and Hall Effect crank trigger.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM simplify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"Does this system support nitrous control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Nitrous control is not supported in the Sniper 2 EFI software.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771437616,"sku":"FRCQ_550-510-3PX-SBF","price":2149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-510-3PX-SBF.jpg?v=1760321622"},{"product_id":"returnless-style-drop-in-module-without-pdm-3-5-in-handheld-550-510-3xd","title":"Holley Sniper 2 EFI Returnless Drop-In Module, Without PDM, 3.5\" Handheld | 550-510-3XD","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with a returnless-style in-tank drop-in fuel module, built for classics running a returnless fuel system. This configuration does not include the optional Power Distribution Module (PDM); wiring connects directly to the throttle body's main harness. A 3.5\" full-color handheld display handles setup and tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003eReturnless-style drop-in fuel module built for in-tank installation\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit, stainless T-bolt clamps, and a stainless weldable flange\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (CD box or MSD Pro Billet\/crank trigger to Sniper 2)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Universal Returnless Drop-In Module\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: No\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3XD\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is a returnless drop-in fuel module?\u003c\/h5\u003e\u003cp\u003eIt's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Power Distribution Module?\u003c\/h5\u003e\u003cp\u003eNo. This configuration wires directly into the throttle body's main harness without the optional PDM.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 3.5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eHow many wiring connections are required?\u003c\/h5\u003e\u003cp\u003eJust four: Battery+, Battery-, Switched Ignition, and RPM.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a returnless drop-in fuel module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Power Distribution Module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This configuration wires directly into the throttle body's main harness without the optional PDM.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 3.5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"How many wiring connections are required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Just four: Battery+, Battery-, Switched Ignition, and RPM.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771601456,"sku":"FRCQ_550-510-3XD","price":2099.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/f8b21bb916f61b99d671c47a39b7e561dab068eb.jpg?v=1760321631"},{"product_id":"inline-pump-without-pdm-3-5-in-handheld-550-510-3xk","title":"Holley Sniper 2 EFI Inline Pump Master Kit, Without PDM, 3.5\" Handheld | 550-510-3XK","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with an inline fuel pump and a genuine Bosch LSU 4.9 wideband oxygen sensor, built for vehicles without an existing in-tank pump. This configuration does not include the optional Power Distribution Module (PDM). A 3.5\" full-color handheld display handles setup and tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit, stainless T-bolt clamps, and a stainless weldable flange\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eMain harness includes plug-and-play HyperSpark distributor support for integrated timing control\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (CD box or MSD Pro Billet\/crank trigger to Sniper 2)\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eWide variety of tuning\/gauge display interfaces: 3.5\" handheld, 5\" digital dash, or Bluetooth dongle for iOS\/Android\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Master Kit (Inline)\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 240 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: No\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3XK\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat fuel pump comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Power Distribution Module?\u003c\/h5\u003e\u003cp\u003eNo, this configuration does not include the optional PDM.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eCan I run this with a HyperSpark ignition?\u003c\/h5\u003e\u003cp\u003eYes. The main harness includes plug-and-play HyperSpark distributor support for integrated timing control.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What fuel pump comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Power Distribution Module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this configuration does not include the optional PDM.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Can I run this with a HyperSpark ignition?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The main harness includes plug-and-play HyperSpark distributor support for integrated timing control.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771666992,"sku":"FRCQ_550-510-3XK","price":1899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/6fd9251e1bf4976e3148d056c8f9af722d068838.jpg?v=1760321639"},{"product_id":"return-style-drop-in-module-without-pdm-3-5-in-handheld-550-510-3xr","title":"Holley Sniper 2 EFI Return-Style Drop-In Module, Without PDM, 3.5\" Handheld, 340 LPH | 550-510-3XR","description":"\u003cp\u003eThis Sniper 2 EFI master kit pairs the self-tuning Sniper 2 throttle body with a 340 LPH return-style in-tank drop-in fuel module, built for classics running a traditional return-style fuel system. This configuration does not include the optional Power Distribution Module (PDM). A 3.5\" full-color handheld display handles setup and tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003eReturn-style drop-in fuel module built for in-tank installation on return-style fuel systems\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit, stainless T-bolt clamps, and a stainless weldable flange\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (CD box or MSD Pro Billet\/crank trigger to Sniper 2)\u003c\/li\u003e\n\u003cli\u003eOnly four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Universal Drop-In Module, In-Tank (Return Style)\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 340 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: No\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 3.5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-3XR\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is a return-style drop-in fuel module?\u003c\/h5\u003e\u003cp\u003eIt's an in-tank fuel module designed for vehicles running a traditional return-style fuel system, where excess fuel is routed back to the tank.\u003c\/p\u003e\u003ch5\u003eWhat is the pump's flow rating?\u003c\/h5\u003e\u003cp\u003e340 LPH.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the Power Distribution Module?\u003c\/h5\u003e\u003cp\u003eNo, this configuration does not include the optional PDM.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a return-style drop-in fuel module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an in-tank fuel module designed for vehicles running a traditional return-style fuel system, where excess fuel is routed back to the tank.\"}},{\"@type\":\"Question\",\"name\":\"What is the pump's flow rating?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"340 LPH.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the Power Distribution Module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this configuration does not include the optional PDM.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771732528,"sku":"FRCQ_550-510-3XR","price":2099.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/247e39345eac764259305d8690d726489b1145ef.jpg?v=1760321647"},{"product_id":"holley-sniper-2-efi-upgrade-5-kit-w-regulator-polished-550-510-5ae","title":"Holley Sniper 2 EFI Upgrade Kit, Polished, External Regulator\/Fittings\/Hose, 5\" Handheld | 550-510-5AE","description":"\u003cp\u003eThis Sniper 2 EFI upgrade kit lets owners of the original Sniper EFI system move up to Sniper 2 without rewiring their vehicle. Simply remove the original Sniper throttle body, unplug the connectors, install the polished Sniper 2 throttle body, and plug the included adapter harness into the existing main harness. This configuration adds an adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay, plus a 5\" full-color handheld display for setup and monitoring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play upgrade path from original Sniper EFI to Sniper 2 in under an hour, no rewiring required\u003c\/li\u003e\n\u003cli\u003eIncludes an adjustable external fuel pressure regulator, AN fittings, and a 3-foot fuel hose for engine-bay mounting\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eReuses the existing coolant temperature sensor and wideband oxygen sensor from the original Sniper install\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance against old wiring, noisy alternators, and faulty plug wires\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eCalibration wizard only requires answering a few simple questions about the engine to build a base map and begin self-tuning, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition, fuel systems, and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI (adjustable external regulator included)\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 9\/16-18 Female O-Ring (AN 6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-5AE\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned specifically as a plug-and-play upgrade for an existing Sniper EFI installation; the original wiring harness stays in place.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does this kit include?\u003c\/h5\u003e\u003cp\u003eAn adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay, along with the polished Sniper 2 throttle body and a 5\" handheld display.\u003c\/p\u003e\u003ch5\u003eDo I need to rewire my vehicle to install this upgrade?\u003c\/h5\u003e\u003cp\u003eNo. It plugs into the existing Sniper EFI wiring harness through an included adapter, so the original harness stays in place.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction, using four 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a fuel pump?\u003c\/h5\u003e\u003cp\u003eNo. This is a throttle body and regulator upgrade kit; it does not include a fuel pump.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does this kit include?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An adjustable external fuel pressure regulator, AN fittings, and a 3-foot section of fuel hose so the regulator can be mounted in the engine bay, along with the polished Sniper 2 throttle body and a 5\\\" handheld display.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to rewire my vehicle to install this upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It plugs into the existing Sniper EFI wiring harness through an included adapter, so the original harness stays in place.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction, using four 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a fuel pump?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This is a throttle body and regulator upgrade kit; it does not include a fuel pump.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper EFI","offers":[{"title":"Default Title","offer_id":42478771798064,"sku":"FRCQ_550-510-5AE","price":1499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-510-5AE_01.jpg?v=1760321655"},{"product_id":"holley-sniper-2-efi-upgrade-5-kit-polished-550-510-5ax","title":"Holley Sniper 2 EFI Upgrade Kit, Polished, 5\" Handheld, 650 HP | 550-510-5AX","description":"\u003cp\u003eThis Sniper 2 EFI base upgrade kit lets owners of the original Sniper EFI system move up to Sniper 2 without rewiring their vehicle. Simply remove the original Sniper throttle body, unplug the connectors, install the polished Sniper 2 throttle body, and plug the included adapter harness into the existing main harness. This configuration includes the throttle body and a 5\" full-color handheld display; a fuel pressure regulator and fuel pump are not included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play upgrade path from original Sniper EFI to Sniper 2 in under an hour, no rewiring required\u003c\/li\u003e\n\u003cli\u003eSupports up to 650 hp naturally aspirated or 575 hp boosted with four 100 lb\/hr injectors\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eReuses the existing coolant temperature sensor and wideband oxygen sensor from the original Sniper install\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eCalibration wizard only requires answering a few simple questions about the engine to build a base map, no laptop required\u003c\/li\u003e\n\u003cli\u003eCompatible with the full Sniper EFI Ecosystem, including HyperSpark ignition, fuel systems, and multiple display interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eFuel Pressure Regulator: Not included\u003c\/li\u003e\n\u003cli\u003eFuel System: Not included\u003c\/li\u003e\n\u003cli\u003eInlet\/Outlet Size: 9\/16-18 Female O-Ring (AN 6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-5AX\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA separate fuel pressure regulator and fuel delivery system are required to complete this installation and are sold separately.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's included in this upgrade kit?\u003c\/h5\u003e\u003cp\u003eThe polished Sniper 2 throttle body and a 5\" handheld display. A fuel pressure regulator and fuel system are not included.\u003c\/p\u003e\u003ch5\u003eDo I need to rewire my vehicle to install this upgrade?\u003c\/h5\u003e\u003cp\u003eNo. It plugs into the existing Sniper EFI wiring harness through an included adapter.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003ch5\u003eDo I need anything else to complete this installation?\u003c\/h5\u003e\u003cp\u003eYes. A fuel pressure regulator and compatible fuel delivery system are required and sold separately.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's included in this upgrade kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The polished Sniper 2 throttle body and a 5\\\" handheld display. A fuel pressure regulator and fuel system are not included.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to rewire my vehicle to install this upgrade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It plugs into the existing Sniper EFI wiring harness through an included adapter.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}},{\"@type\":\"Question\",\"name\":\"Do I need anything else to complete this installation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. 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The optional Power Distribution Module (PDM) isolates the core EFI and ignition wiring into one location: slide the stripped wire ends under the positive-lock connector, tighten the set screw, and only battery power and a switched 12-volt source are required. A 5\" full-color handheld display handles setup and tuning.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003e340 LPH returnless-style drop-in fuel module built for in-tank installation\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit and stainless T-bolt clamps\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module (PDM) simplifies wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eMain harness includes plug-and-play HyperSpark distributor support for integrated timing control\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Universal Returnless Drop-In Module\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 340 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-5PD\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInstalls at home with common hand tools using Holley's installation manual and video support.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is a returnless drop-in fuel module?\u003c\/h5\u003e\u003cp\u003eIt's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\u003c\/p\u003e\u003ch5\u003eWhat is the pump's flow rating?\u003c\/h5\u003e\u003cp\u003e340 LPH.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM do?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, reducing vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eHow much horsepower does this system support?\u003c\/h5\u003e\u003cp\u003eUp to 650 hp naturally aspirated or 575 hp with forced induction.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is a returnless drop-in fuel module?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's an in-tank fuel module built for vehicles running a returnless-style fuel system, replacing the need for a separate return line to the tank.\"}},{\"@type\":\"Question\",\"name\":\"What is the pump's flow rating?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"340 LPH.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, reducing vehicle-side wiring to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 hp naturally aspirated or 575 hp with forced induction.\"}}]}\u003c\/script\u003e","brand":"Holley Sniper 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It's built for vehicles that don't already have an in-tank pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll-new Sniper 2 design built on the proven Sniper EFI conversion platform\u003c\/li\u003e\n\u003cli\u003e240 LPH inline fuel pump master kit for vehicles without an existing in-tank pump\u003c\/li\u003e\n\u003cli\u003eIncludes a genuine Bosch LSU 4.9 wideband oxygen sensor with clamp-on kit, stainless T-bolt clamps, and a stainless weldable flange for a leak-free install\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module (PDM) simplifies wiring to essentially battery, ground, and a switched 12-volt source\u003c\/li\u003e\n\u003cli\u003eCast-in fuel crossover from the primary to secondary fuel rail\u003c\/li\u003e\n\u003cli\u003eNext-generation ECU offers improved RF noise and interference resistance\u003c\/li\u003e\n\u003cli\u003eRedesigned injector connector for improved reliability\u003c\/li\u003e\n\u003cli\u003eRedesigned throttle shaft and plate geometry for a smoother throttle feel\u003c\/li\u003e\n\u003cli\u003e\"Hidden Harness\" wiring exits from the rear of the throttle body for a clean installation\u003c\/li\u003e\n\u003cli\u003eMain harness includes plug-and-play HyperSpark distributor support for integrated timing control\u003c\/li\u003e\n\u003cli\u003eAdapters for other ignition types sold separately (CD box or MSD Pro Billet\/crank trigger to Sniper 2)\u003c\/li\u003e\n\u003cli\u003eNext-generation mil-spec style M8 positive-lock connector for CAN1\/CAN2\u003c\/li\u003e\n\u003cli\u003eSniper 2 throttle bodies are individually serialized for improved customer service and warranty tracking\u003c\/li\u003e\n\u003cli\u003eIntegrated transmission kick-down provisions for GM TH350\/400, 200-4R\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFlange Style: 4150\u003c\/li\u003e\n\u003cli\u003eCFM: 800\u003c\/li\u003e\n\u003cli\u003eFuel System: Inline Master Kit\u003c\/li\u003e\n\u003cli\u003eFuel Pump Flow Rating: 240 LPH\u003c\/li\u003e\n\u003cli\u003eInjector Size: 100 lb\/hr @ 58.5 PSI (4 injectors)\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 2 Bar\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP naturally aspirated \/ 575 HP boosted\u003c\/li\u003e\n\u003cli\u003ePower Distribution Module: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Compatibility: All\u003c\/li\u003e\n\u003cli\u003eUser Interface: 5\" Handheld\u003c\/li\u003e\n\u003cli\u003eFinish: Polished\u003c\/li\u003e\n\u003cli\u003eWarranty: Two-Year Standard, extendable via product registration\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-510-5PK\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: Nitrous control is not supported in the Sniper 2 EFI software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat fuel pump comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\u003c\/p\u003e\u003ch5\u003eDoes this kit include an oxygen sensor?\u003c\/h5\u003e\u003cp\u003eYes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\u003c\/p\u003e\u003ch5\u003eWhat does the PDM simplify?\u003c\/h5\u003e\u003cp\u003eIt isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\u003c\/p\u003e\u003ch5\u003eWhat size display comes with this kit?\u003c\/h5\u003e\u003cp\u003eA 5\" full-color handheld display.\u003c\/p\u003e\u003ch5\u003eCan I run this with a HyperSpark ignition?\u003c\/h5\u003e\u003cp\u003eYes. The main harness includes plug-and-play HyperSpark distributor support for integrated timing control.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What fuel pump comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 240 LPH inline fuel pump, sized for vehicles that don't already have an in-tank pump.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include an oxygen sensor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a genuine Bosch LSU 4.9 wideband oxygen sensor with a clamp-on install kit is included.\"}},{\"@type\":\"Question\",\"name\":\"What does the PDM simplify?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It isolates the core EFI and ignition wiring into one location, cutting vehicle-side wiring down to essentially battery power, ground, and a switched 12-volt source.\"}},{\"@type\":\"Question\",\"name\":\"What size display comes with this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 5\\\" full-color handheld display.\"}},{\"@type\":\"Question\",\"name\":\"Can I run this with a HyperSpark ignition?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. 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