{"title":"Holley Terminator","description":"","products":[{"product_id":"hyperspark-ignition-adapter-558-323","title":"Holley EFI HyperSpark Ignition Adapter, For Terminator X, Universal | 558-323","description":"\u003cp\u003eThis adapter lets a HyperSpark distributor plug directly into a Holley EFI main harness's ignition connector, enabling a \"timed sequential\" fuel strategy on Terminator X installations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFor Use With: HyperSpark distributors and Terminator X\u003c\/li\u003e\n\u003cli\u003eFunction: Enables timed sequential fuel strategy\u003c\/li\u003e\n\u003cli\u003eConnectors: 2\u003c\/li\u003e\n\u003cli\u003eWiring: Routed through protective sleeve\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eLength: 17\"\u003c\/li\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-323\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is this adapter used for?\u003c\/h5\u003e\u003cp\u003eIt lets a HyperSpark distributor plug directly into a Holley EFI main harness's ignition connector.\u003c\/p\u003e\u003ch5\u003eWhat ECU does it work with?\u003c\/h5\u003e\u003cp\u003eTerminator X, when paired with HyperSpark ignition.\u003c\/p\u003e\u003ch5\u003eWhat fuel strategy does it enable?\u003c\/h5\u003e\u003cp\u003eA \"timed sequential\" fuel strategy.\u003c\/p\u003e\u003ch5\u003eHow many connectors does it have?\u003c\/h5\u003e\u003cp\u003eTwo, with wiring routed through a protective sleeve.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is this adapter used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It lets a HyperSpark distributor plug directly into a Holley EFI main harness's ignition connector.\"}},{\"@type\":\"Question\",\"name\":\"What ECU does it work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Terminator X, when paired with HyperSpark ignition.\"}},{\"@type\":\"Question\",\"name\":\"What fuel strategy does it enable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A \\\"timed sequential\\\" fuel strategy.\"}},{\"@type\":\"Question\",\"name\":\"How many connectors does it have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Two, with wiring routed through a protective sleeve.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418567741488,"sku":"GVMR_558-323","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-323_0119269.jpg?v=1758384154"},{"product_id":"holley-efi-pro-billet-ignition-adapter-558-325","title":"Holley EFI Pro-Billet Ignition Adapter, For MSD Distributors, Terminator X | 558-325","description":"\u003cp\u003eThis adapter provides plug-and-play ignition timing control when running an MSD Pro-Billet distributor with a Holley EFI main harness that has an ignition connector, such as Holley part number 558-104.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFor Use With: MSD Pro-Billet distributors and Terminator X\u003c\/li\u003e\n\u003cli\u003eCompatible Harness: Holley 558-104\u003c\/li\u003e\n\u003cli\u003eConnectors: 2\u003c\/li\u003e\n\u003cli\u003eWiring: Routed through protective sleeve\u003c\/li\u003e\n\u003cli\u003eHarness Application: Universal\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-325\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat distributor does this adapter work with?\u003c\/h5\u003e\u003cp\u003eMSD Pro-Billet distributors.\u003c\/p\u003e\u003ch5\u003eWhat ECU is it compatible with?\u003c\/h5\u003e\u003cp\u003eTerminator X, when using a Holley EFI main harness with an ignition connector such as part 558-104.\u003c\/p\u003e\u003ch5\u003eWhat does it enable?\u003c\/h5\u003e\u003cp\u003ePlug-and-play ignition timing control with an MSD Pro-Billet distributor.\u003c\/p\u003e\u003ch5\u003eHow many connectors are included?\u003c\/h5\u003e\u003cp\u003eTwo, wired through a protective sleeve.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What distributor does this adapter work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"MSD Pro-Billet distributors.\"}},{\"@type\":\"Question\",\"name\":\"What ECU is it compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Terminator X, when using a Holley EFI main harness with an ignition connector such as part 558-104.\"}},{\"@type\":\"Question\",\"name\":\"What does it enable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Plug-and-play ignition timing control with an MSD Pro-Billet distributor.\"}},{\"@type\":\"Question\",\"name\":\"How many connectors are included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Two, wired through a protective sleeve.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418567807024,"sku":"GVMR_558-325","price":42.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-325_02.jpg?v=1758384161"},{"product_id":"holley-terminator-x-max-550-928","title":"Holley Terminator X Max, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBW, EV6, 4L60E\/4L80E | 550-928","description":"\u003cp\u003eThis Terminator X Max system adds 4L60E\/4L80E automatic transmission control and drive-by-wire throttle body control to Holley's Terminator X platform, along with real-time fuel learn, high-impedance injector drivers, and an integrated 1-bar MAP sensor for GM Gen IV LS engines (4.8\/5.3\/6.0 truck and LS2\/LS3). A 3.5in touchscreen handheld provides a guided calibration wizard, real-time tuning, data logging, and a fully customizable gauge display, and the kit ships loaded with base maps for common LS combinations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS 4.8\/5.3\/6.0 truck engines and LS2\/LS3 with 58x crank, 4x cam, EV6 (USCAR) injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes much of the guesswork from base fuel table tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS injectors and Holley EFI injectors (does not control low-impedance injectors; injector support chart included in instructions)\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor relays AFR data to the ECU for accurate, precise tuning\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor suited to naturally aspirated or nitrous combinations; for 2+ bar boosted applications, Holley recommends GM sensor 12592525 with adapter part number 558-416\u003c\/li\u003e\n\u003cli\u003eMAP sensor vacuum hose adapters (1\/8in, 1\/4in, and 3\/16in) included\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for pressure sensors, nitrous activation triggers, or a trans-brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, idle air control, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: boost vs. time, boost vs. gear, boost vs. RPM, boost vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel, wet or dry, progressive or non-progressive, with rich\/lean safeties and closed-loop AFR targeting\u003c\/li\u003e\n\u003cli\u003eAdvanced programmable tables: four 1D tables, one 1D per-gear table, four 2D tables, and one 2D per-gear table for custom uses such as a flex-fuel sensor offset table or a fuel\/oil pressure safety\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal\u003c\/li\u003e\n\u003cli\u003eIncluded 3.5in touchscreen handheld provides a calibration wizard for quick base-tune setup, internal data logging, and a customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU can be mounted virtually anywhere, provided the diagnostic LEDs face up\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and digital\/Pro Dash displays (Holley part numbers 553-106, 553-111, and 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software included for full laptop-based control\u003c\/li\u003e\n\u003cli\u003eRecommended electronic throttle pedal: part number 10379038\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: EFI System (Terminator X Max)\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, 4x cam\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5in touchscreen\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1 Bar (2+ bar via GM 12592525 + adapter 558-416)\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS main harness, EV6 injector harness, drive-by-wire throttle body harness, 4L60E\/4L80E transmission control harness, ECU, ECU main power harness, Bosch LSU 4.9 wideband O2 sensor, I\/O harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-928\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, and not compatible with 4L6X transmissions from model year 1995 or earlier due to differences in converter lockup and downshift strategy. Not recommended for marine use, though it can be installed in off-road applications if mounted in a dry, heat-protected location.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the Terminator X Max add over the standard Terminator X?\u003c\/h5\u003e\u003cp\u003e4L60E\/4L80E automatic transmission control and drive-by-wire throttle body control, plus a 3.5in touchscreen handheld for tuning, data logging, and gauge display.\u003c\/p\u003e\u003ch5\u003eWill this work with a 4x4 truck that has an electronic transfer case?\u003c\/h5\u003e\u003cp\u003eNo, Holley does not recommend the Terminator X Max for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eIs this compatible with older 4L60E\/4L80E transmissions?\u003c\/h5\u003e\u003cp\u003eNo. It's not compatible with 4L6X transmissions from model year 1995 or earlier, due to year-by-year differences in converter lockup and downshift strategy.\u003c\/p\u003e\u003ch5\u003eCan this ECU be used in a marine application?\u003c\/h5\u003e\u003cp\u003eHolley does not recommend it for marine use, though it can be used in off-road applications if mounted in a dry location away from heat.\u003c\/p\u003e\u003ch5\u003eWhat if my build needs more boost than the stock 1-bar MAP sensor supports?\u003c\/h5\u003e\u003cp\u003eHolley recommends the GM 12592525 MAP sensor paired with adapter part number 558-416 for 2+ bar boosted applications.\u003c\/p\u003e\u003ch5\u003eWhat electronic throttle pedal does Holley recommend for this kit?\u003c\/h5\u003e\u003cp\u003ePart number 10379038.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the Terminator X Max add over the standard Terminator X?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"4L60E\/4L80E automatic transmission control and drive-by-wire throttle body control, plus a 3.5in touchscreen handheld for tuning, data logging, and gauge display.\"}},{\"@type\":\"Question\",\"name\":\"Will this work with a 4x4 truck that has an electronic transfer case?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, Holley does not recommend the Terminator X Max for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"Is this compatible with older 4L60E\/4L80E transmissions?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It's not compatible with 4L6X transmissions from model year 1995 or earlier, due to year-by-year differences in converter lockup and downshift strategy.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU be used in a marine application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, Holley does not recommend it for marine use, though it can be used in off-road applications if mounted in a dry location away from heat.\"}},{\"@type\":\"Question\",\"name\":\"What if my build needs more boost than the stock 1-bar MAP sensor supports?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley recommends the GM 12592525 MAP sensor paired with adapter part number 558-416 for 2+ bar boosted applications.\"}},{\"@type\":\"Question\",\"name\":\"What electronic throttle pedal does Holley recommend for this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Part number 10379038.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418567872560,"sku":"GVMR_550-928","price":2199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974.jpg?v=1758384171"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-932","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBW, EV6 | 550-932","description":"\u003cp\u003eTerminator X Max gives GM LS1\/LS6 engines complete fuel and spark control at a budget-friendly price, without the hassles of a cumbersome junkyard ECU tuning interface. Real-time fuel learn, high-impedance injector drivers, an onboard wideband oxygen sensor, and a full base-map library get the engine running quickly, while the 3.5-inch touchscreen handheld makes calibration approachable for first-time EFI builders.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS1\/LS6 engines with 24x crank reluctor, Drive-By-Wire throttle body, and EV6 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learning removes guesswork from base fuel tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely run most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eOnboard Bosch LSU 4.9 wideband for accurate AFR reading\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-bar MAP sensor, ideal for N\/A or nitrous combos (2+ bar needs GM 12592525 and adapter 558-416)\u003c\/li\u003e\n\u003cli\u003eIncludes MAP sensor vacuum hose adapters (1\/8\"-1\/4\" and 3\/16\")\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for sensors or activation triggers\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs (ground, PWM-) for fans, boost control, nitrous, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control vs. time, gear, RPM, or speed, with boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel, wet or dry, progressive or non-progressive, with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced custom tables (1D and 2D, including per-gear) for flex fuel offsets or custom safety tables\u003c\/li\u003e\n\u003cli\u003eOnboard diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank\/cam signal\u003c\/li\u003e\n\u003cli\u003e3.5\" touchscreen handheld with calibration wizard, data-logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\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: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, onboard\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV6 Injector Harness, DBW Throttle Body Harness, Terminator X MAX ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-932\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU mounts with LEDs facing up; designed for 6-pin GM throttle bodies (12570790, 12580760, 12629992, 12605109) and GM throttle pedal 10379038. Not recommended for marine applications, but suitable for off-road use in a safe, dry, heat-protected location.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat LS engines is the 550-932 Terminator X Max built for?\u003c\/h5\u003e\u003cp\u003eGM LS1\/LS2\/LS6 engines with a 24x crank reluctor and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it control a drive-by-wire throttle body?\u003c\/h5\u003e\u003cp\u003eYes, this version includes Drive-By-Wire throttle body control.\u003c\/p\u003e\u003ch5\u003eWhat wideband sensor is included?\u003c\/h5\u003e\u003cp\u003eA genuine Bosch LSU 4.9 wideband oxygen sensor for accurate AFR feedback.\u003c\/p\u003e\u003ch5\u003eHow many programmable inputs and outputs does it have?\u003c\/h5\u003e\u003cp\u003e4 programmable inputs and 4 programmable outputs for accessories like fans, boost control, and nitrous.\u003c\/p\u003e\u003ch5\u003eDoes it include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5-inch touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eCan it be used on a marine application?\u003c\/h5\u003e\u003cp\u003eNo, it's not recommended for marine use, but it can be used in off-road applications if mounted in a safe, dry, heat-protected location.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What LS engines is the 550-932 Terminator X Max built for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS1\/LS2\/LS6 engines with a 24x crank reluctor and EV6 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it control a drive-by-wire throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, this version includes Drive-By-Wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"What wideband sensor is included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A genuine Bosch LSU 4.9 wideband oxygen sensor for accurate AFR feedback.\"}},{\"@type\":\"Question\",\"name\":\"How many programmable inputs and outputs does it have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"4 programmable inputs and 4 programmable outputs for accessories like fans, boost control, and nitrous.\"}},{\"@type\":\"Question\",\"name\":\"Does it include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5-inch touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"Can it be used on a marine application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's not recommended for marine use, but it can be used in off-road applications if mounted in a safe, dry, heat-protected location.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418567938096,"sku":"GVMR_550-932","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974_9f8f7143-218b-4948-ae62-2f3b74f00a31.jpg?v=1758384179"},{"product_id":"holley-terminator-x-max-gen-iv-truck-ls2-ls3-550-920","title":"Holley Terminator X Max, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBC, EV1, 4L60E\/4L80E | 550-920","description":"\u003cp\u003eThis Terminator X Max configuration is built for Gen IV GM LS truck engines and LS2\/LS3 applications, adding 4L60E\/4L80E transmission control on top of the same real-time fuel learning, high-impedance injector drivers, and onboard wideband tuning found across the Terminator X Max lineup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for Gen IV GM LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 with 58x crank, 4x cam, and EV1 injectors\u003c\/li\u003e\n\u003cli\u003eIncludes 4L60E\/4L80E automatic transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learning removes guesswork from base fuel tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers for stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eOnboard Bosch LSU 4.9 wideband for accurate AFR reading\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-bar MAP sensor with vacuum hose adapters (1\/8\"-1\/4\" and 3\/16\")\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control vs. time, gear, RPM, or speed, with boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel, progressive or non-progressive, with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced custom 1D\/2D and per-gear tables\u003c\/li\u003e\n\u003cli\u003eOnboard diagnostic LEDs for critical engine issues at a glance\u003c\/li\u003e\n\u003cli\u003e3.5\" touchscreen handheld with calibration wizard and internal data-logging\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen IV GM LS truck (4.8\/5.3\/6.0), LS2\/LS3\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 EV1)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, onboard\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS Engine Main Harness, EV1 Injector Harness, 4L60E\/4L80E Transmission Control Harness, Terminator X MAX ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-920\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier due to converter lockup and downshift strategy differences. Not recommended for marine use.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-920 Terminator X Max support?\u003c\/h5\u003e\u003cp\u003eGen IV GM LS truck engines (4.8L, 5.3L, 6.0L) and LS2\/LS3, with a 58x crank\/4x cam signal and EV1 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this version include transmission control?\u003c\/h5\u003e\u003cp\u003eYes, it controls 4L60E or 4L80E automatic transmissions.\u003c\/p\u003e\u003ch5\u003eIs it compatible with 4x4 trucks?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eWill it work with an older 4L60E transmission?\u003c\/h5\u003e\u003cp\u003eNo, it's not compatible with 4L6X transmissions built in model year 1995 or earlier due to differences in converter lockup and downshift strategy.\u003c\/p\u003e\u003ch5\u003eDoes it support Drive-By-Wire throttle bodies?\u003c\/h5\u003e\u003cp\u003eNo, this configuration does not include Drive-By-Wire control.\u003c\/p\u003e\u003ch5\u003eWhat's included in the box?\u003c\/h5\u003e\u003cp\u003eThe 58x\/4x LS main harness, EV1 injector harness, transmission control harness, ECU, wideband O2 sensor, I\/O harness, and vacuum adapters.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-920 Terminator X Max support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Gen IV GM LS truck engines (4.8L, 5.3L, 6.0L) and LS2\/LS3, with a 58x crank\/4x cam signal and EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this version include transmission control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it controls 4L60E or 4L80E automatic transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Is it compatible with 4x4 trucks?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"Will it work with an older 4L60E transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's not compatible with 4L6X transmissions built in model year 1995 or earlier due to differences in converter lockup and downshift strategy.\"}},{\"@type\":\"Question\",\"name\":\"Does it support Drive-By-Wire throttle bodies?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this configuration does not include Drive-By-Wire control.\"}},{\"@type\":\"Question\",\"name\":\"What's included in the box?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 58x\/4x LS main harness, EV1 injector harness, transmission control harness, ECU, wideband O2 sensor, I\/O harness, and vacuum adapters.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418568003632,"sku":"GVMR_550-920","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974_efb32000-7c65-4669-a3d9-e3026cfad754.jpg?v=1758384187"},{"product_id":"ford-automatic-trans-spring-and-perch-bracket-20-152","title":"Holley EFI Terminator Ford Transmission Kickdown Bracket Kit | 20-152","description":"\u003cp\u003eThis spring and bracket kit is needed when running a Ford automatic transmission with a Terminator EFI kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFor: Ford automatic transmissions used with a Terminator EFI kit\u003c\/li\u003e\n\u003cli\u003eIncludes: Spring, bracket, hardware\u003c\/li\u003e\n\u003cli\u003eColor: Silver\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 20-152\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhen do I need this kickdown bracket kit?\u003c\/h5\u003e\u003cp\u003eWhen running a Ford automatic transmission with a Terminator EFI kit.\u003c\/p\u003e\u003ch5\u003eWhat's included?\u003c\/h5\u003e\u003cp\u003eA spring, bracket, and mounting hardware.\u003c\/p\u003e\u003ch5\u003eWhat color is the bracket?\u003c\/h5\u003e\u003cp\u003eSilver.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"When do I need this kickdown bracket kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"When running a Ford automatic transmission with a Terminator EFI kit.\"}},{\"@type\":\"Question\",\"name\":\"What's included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A spring, bracket, and mounting hardware.\"}},{\"@type\":\"Question\",\"name\":\"What color is the bracket?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Silver.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418568331312,"sku":"GVMR_20-152","price":25.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/20-152_01.jpg?v=1758384222"},{"product_id":"compatible-w-sniper-efi-stealth-4150-and-terminator-x-stealth-4150-systems-534-247","title":"Holley EFI Stealth 4150 Fuel Log, 6AN, For Sniper\/Terminator X Stealth | 534-247","description":"\u003cp\u003eThe Stealth 4150 Fuel Log is a pre-assembled fuel crossover designed for Sniper EFI Stealth 4150 or Terminator X Stealth 4150 systems, giving clearance between the fuel hose and the TPS sensor mounted on the side of the throttle body.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible With: Sniper EFI Stealth 4150 and Terminator X Stealth 4150 systems\u003c\/li\u003e\n\u003cli\u003eFitting Size: -6AN male (inlet and outlet)\u003c\/li\u003e\n\u003cli\u003eMaterial: Billet aluminum\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eNote: Throttle body not included, for installation reference only\u003c\/li\u003e\n\u003cli\u003eWarning: California Proposition 65\u003c\/li\u003e\n\u003cli\u003ePart Number: 534-247\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat systems does this fuel log fit?\u003c\/h5\u003e\u003cp\u003eSniper EFI Stealth 4150 and Terminator X Stealth 4150 systems.\u003c\/p\u003e\u003ch5\u003eWhat fitting size does it use?\u003c\/h5\u003e\u003cp\u003e-6AN male inlet and outlet.\u003c\/p\u003e\u003ch5\u003eWhy is this fuel log needed?\u003c\/h5\u003e\u003cp\u003eIt provides clearance between the fuel hose and the TPS sensor mounted on the side of the Stealth 4150 throttle body.\u003c\/p\u003e\u003ch5\u003eIs the throttle body included?\u003c\/h5\u003e\u003cp\u003eNo, it's sold separately — this is the fuel log\/crossover only.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What systems does this fuel log fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sniper EFI Stealth 4150 and Terminator X Stealth 4150 systems.\"}},{\"@type\":\"Question\",\"name\":\"What fitting size does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"-6AN male inlet and outlet.\"}},{\"@type\":\"Question\",\"name\":\"Why is this fuel log needed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It provides clearance between the fuel hose and the TPS sensor mounted on the side of the Stealth 4150 throttle body.\"}},{\"@type\":\"Question\",\"name\":\"Is the throttle body included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's sold separately — this is the fuel log\/crossover only.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418568626224,"sku":"GVMR_534-247","price":80.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/52r838a_06.jpg?v=1758384253"},{"product_id":"plug-and-play-transmission-harness-for-1992-1997-ford-aode-4r70w-558-471","title":"Holley Transmission Control Harness, 1992-1997 Ford AODE\/4R70W, Dominator\/Terminator X Max | 558-471","description":"\u003cp\u003eThis Holley EFI transmission control harness delivers plug-and-play control for 1992-1997 Ford AODE\/4R70W automatic transmissions when paired with a Dominator or Terminator X Max ECU. It ships fully terminated with five connectors and three unterminated leads, keeping installation straightforward.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 1992-1997 Ford AODE\/4R70W automatic transmission\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Dominator, Terminator X Max only\u003c\/li\u003e\n\u003cli\u003eConnectors: (5) fully terminated connectors, (6) unterminated loose wires\u003c\/li\u003e\n\u003cli\u003eMinimum software: version 5.0 build 100 or higher\u003c\/li\u003e\n\u003cli\u003eMinimum ECU firmware: 5.0 build 110 or higher\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-471\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot compatible with 4WD installations.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat transmissions does the 558-471 harness support?\u003c\/h5\u003e\u003cp\u003eIt's built specifically for 1992-1997 Ford AODE\/4R70W automatic transmissions.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI ECUs work with this harness?\u003c\/h5\u003e\u003cp\u003eOnly the Dominator and Terminator X Max ECUs support transmission control through this harness.\u003c\/p\u003e\u003ch5\u003eWhat software and firmware do I need before installing it?\u003c\/h5\u003e\u003cp\u003eYou'll need software version 5.0 build 100 or higher and ECU firmware 5.0 build 110 or higher.\u003c\/p\u003e\u003ch5\u003eWill this harness work on a 4WD vehicle?\u003c\/h5\u003e\u003cp\u003eNo, this harness is not compatible with 4WD installations.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What transmissions does the 558-471 harness support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built specifically for 1992-1997 Ford AODE\/4R70W automatic transmissions.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECUs work with this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Only the Dominator and Terminator X Max ECUs support transmission control through this harness.\"}},{\"@type\":\"Question\",\"name\":\"What software and firmware do I need before installing it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"You'll need software version 5.0 build 100 or higher and ECU firmware 5.0 build 110 or higher.\"}},{\"@type\":\"Question\",\"name\":\"Will this harness work on a 4WD vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this harness is not compatible with 4WD installations.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418568953904,"sku":"GVMR_558-471","price":311.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-471_011981.jpg?v=1758384278"},{"product_id":"holley-terminator-x-gen-iv-truck-ls2-ls3-550-910","title":"Holley Terminator X, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBC, EV1 | 550-910","description":"\u003cp\u003eTerminator X gives GM LS Gen IV truck and LS2\/LS3 engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. It comes fully loaded with base maps for common LS engine combinations to get you on the road fast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 58x crank, 4x cam signal, and EV1 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs for fans, boost control, nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen IV GM LS Truck \/ LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, Cam Signal: 4x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV1 (Jetronic\/Minitimer)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS Engine Main Harness, EV1 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-910\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-910 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank and 4x cam signal.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system support?\u003c\/h5\u003e\u003cp\u003eIt's set up for EV1 (Jetronic\/Minitimer) style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\u003c\/p\u003e\u003ch5\u003eCan I add boost or nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-910 Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank and 4x cam signal.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's set up for EV1 (Jetronic\/Minitimer) style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\"}},{\"@type\":\"Question\",\"name\":\"Can I add boost or nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Terminator X ECU should be mounted with its diagnostic LEDs facing up.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569019440,"sku":"GVMR_550-910","price":1599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/diucjf3u1974.jpg?v=1758384285"},{"product_id":"holley-terminator-x-ls1-ls2-ls6-550-909t","title":"Holley Terminator X, GM LS1\/LS2\/LS6, DBC, EV6 | 550-909T","description":"\u003cp\u003eTerminator X gives GM LS1\/LS6 engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. This kit uses a USB\/CAN tuning cable in place of the handheld and requires the free Terminator X software for initial setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor and EV6 (USCAR) injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combos (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)\u003c\/li\u003e\n\u003cli\u003eVacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable for real-time configuration and tuning\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No, USB\/CAN tuning cable included instead\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV6 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-909T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-909T Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV6 (USCAR) injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eNo, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\u003c\/p\u003e\u003ch5\u003eCan this system run boosted applications above 1 bar?\u003c\/h5\u003e\u003cp\u003eFor boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\u003c\/p\u003e\u003ch5\u003eCan I add nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\u003c\/p\u003e\u003ch5\u003eWhat's included with the 550-909T kit?\u003c\/h5\u003e\u003cp\u003eIt includes the 24x LS engine main harness, EV6 injector harness, Terminator X ECU, ECU power harness, Bosch LSU 4.9 wideband oxygen sensor, I\/O harness, USB\/CAN tuning cable, and vacuum adapters.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-909T Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV6 (USCAR) injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\"}},{\"@type\":\"Question\",\"name\":\"Can this system run boosted applications above 1 bar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\"}},{\"@type\":\"Question\",\"name\":\"Can I add nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\"}},{\"@type\":\"Question\",\"name\":\"What's included with the 550-909T kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It includes the 24x LS engine main harness, EV6 injector harness, Terminator X ECU, ECU power harness, Bosch LSU 4.9 wideband oxygen sensor, I\/O harness, USB\/CAN tuning cable, and vacuum adapters.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569117744,"sku":"GVMR_550-909T","price":1449.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-w-tuner-cable19277.jpg?v=1758384292"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-934t","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBW, EV6, 4L60E\/4L80E | 550-934T","description":"\u003cp\u003eTerminator X Max extends Holley EFI's standalone engine control to GM LS1\/LS6 engines with drive-by-wire throttle body control and 4L60E\/4L80E transmission control built in. It replaces a junkyard ECU with real-time fuel learn and race-proven tuning technology, and uses a USB\/CAN tuning cable with the free Terminator X software for setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor, EV6 injectors, drive-by-wire throttle body, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost\/nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable; software includes multiple base calibrations for naturally aspirated or boosted engines\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003cli\u003eRecommended drive-by-wire pedal: P\/N 10379038\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes | Transmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No, USB\/CAN tuning cable included instead\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV6 Injector Harness, DBW Throttle Body Harness, 4L60E\/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-934T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier due to year-by-year changes in converter lockup and downshift strategy. Not recommended for marine applications, but can be used off-road in a dry, protected, heat-shielded location with proper wiring management.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 550-934T control besides fuel and spark?\u003c\/h5\u003e\u003cp\u003eIt adds drive-by-wire throttle body control and 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eNo, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\u003c\/p\u003e\u003ch5\u003eWill this work with a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eWhat transmissions are NOT supported?\u003c\/h5\u003e\u003cp\u003e4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\u003c\/p\u003e\u003ch5\u003eWhat throttle pedal is recommended?\u003c\/h5\u003e\u003cp\u003eHolley recommends pedal part number 10379038 for drive-by-wire installations.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 550-934T control besides fuel and spark?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adds drive-by-wire throttle body control and 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\"}},{\"@type\":\"Question\",\"name\":\"Will this work with a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"What transmissions are NOT supported?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\"}},{\"@type\":\"Question\",\"name\":\"What throttle pedal is recommended?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Holley recommends pedal part number 10379038 for drive-by-wire installations.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569183280,"sku":"GVMR_550-934T","price":2149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-max-w-tuner-cable19277.jpg?v=1758384301"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-916t","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBC, EV1, 4L60E\/4L80E | 550-916T","description":"\u003cp\u003eTerminator X Max gives GM LS1\/LS6 engines complete standalone engine control with 4L60E\/4L80E transmission control built in. It replaces a junkyard ECU with real-time fuel learn and Holley EFI's race-proven tuning technology, and uses a USB\/CAN tuning cable with the free Terminator X software for initial setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor, EV1 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost\/nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable; software includes multiple base calibrations for naturally aspirated or boosted engines\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (EV1)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No, USB\/CAN tuning cable included instead\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV1 Injector Harness, 4L60E\/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-916T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier. Not recommended for marine applications, but can be used off-road in a dry, protected, heat-shielded location with proper wiring management.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 550-916T control besides fuel and spark?\u003c\/h5\u003e\u003cp\u003eIt adds 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eNo, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system use?\u003c\/h5\u003e\u003cp\u003eIt's configured for EV1 (Jetronic\/Minitimer) style injectors.\u003c\/p\u003e\u003ch5\u003eWill this work with a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eWhat transmissions are NOT supported?\u003c\/h5\u003e\u003cp\u003e4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 550-916T control besides fuel and spark?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adds 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's configured for EV1 (Jetronic\/Minitimer) style injectors.\"}},{\"@type\":\"Question\",\"name\":\"Will this work with a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"What transmissions are NOT supported?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569248816,"sku":"GVMR_550-916T","price":1949.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-max-w-tuner-cable19277_cc813d79-a27d-4c94-8e77-71ee0e19533c.jpg?v=1758384309"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-916","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBC, EV1, 4L60E\/4L80E | 550-916","description":"\u003cp\u003eTerminator X Max gives GM LS1\/LS6 engines complete standalone engine control with 4L60E\/4L80E transmission control built in. It replaces a junkyard ECU with real-time fuel learn and Holley EFI's race-proven tuning technology, and includes a 3.5 in. touchscreen handheld for calibration and gauge display right out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor, EV1 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost\/nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (EV1)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV1 Injector Harness, 4L60E\/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-916\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier. Not recommended for marine applications, but can be used off-road in a dry, protected, heat-shielded location with proper wiring management.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 550-916 control besides fuel and spark?\u003c\/h5\u003e\u003cp\u003eIt adds 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system use?\u003c\/h5\u003e\u003cp\u003eIt's configured for EV1 (Jetronic\/Minitimer) style injectors.\u003c\/p\u003e\u003ch5\u003eWill this work with a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eWhat transmissions are NOT supported?\u003c\/h5\u003e\u003cp\u003e4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 550-916 control besides fuel and spark?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adds 4L60E\/4L80E automatic transmission control on top of standard Terminator X Max engine control.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's configured for EV1 (Jetronic\/Minitimer) style injectors.\"}},{\"@type\":\"Question\",\"name\":\"Will this work with a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"What transmissions are NOT supported?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569314352,"sku":"GVMR_550-916","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v419741986.jpg?v=1758384318"},{"product_id":"holley-terminator-x-max-gen-iv-truck-ls2-ls3-550-931","title":"Holley Terminator X Max, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBW, EV6 | 550-931","description":"\u003cp\u003eTerminator X Max brings complete standalone engine control to Gen IV GM 4.8\/5.3\/6.0 truck engines and LS2\/LS3, with drive-by-wire throttle body control built in. It replaces a junkyard ECU with real-time fuel learn and Holley EFI's race-proven tuning technology, and includes a 3.5 in. touchscreen handheld for calibration and gauge display right out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM 4.8\/5.3\/6.0 LS truck engines and LS2\/LS3 with 58x crank, 4x cam, EV6 injectors, and drive-by-wire throttle body control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost\/nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003cli\u003eRecommended drive-by-wire pedal: P\/N 10379038\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen IV GM LS Truck \/ LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, Cam Signal: 4x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS Engine Main Harness, EV6 Injector Harness, DBW Throttle Body Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-931\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned to work with GM throttle body P\/N 12570790 or 12580760, and GM throttle pedal P\/N 10379038. Terminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-931 Terminator X Max system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank, 4x cam, and drive-by-wire throttle body control.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhich throttle body does this system support?\u003c\/h5\u003e\u003cp\u003eIt's designed to work with GM throttle body part numbers 12570790 and 12580760.\u003c\/p\u003e\u003ch5\u003eCan this system run boosted applications above 1 bar?\u003c\/h5\u003e\u003cp\u003eFor boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X Max ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-931 Terminator X Max system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank, 4x cam, and drive-by-wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"Which throttle body does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed to work with GM throttle body part numbers 12570790 and 12580760.\"}},{\"@type\":\"Question\",\"name\":\"Can this system run boosted applications above 1 bar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Terminator X Max ECU should be mounted with its diagnostic LEDs facing up.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569379888,"sku":"GVMR_550-931","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974_62731dc0-dc19-4582-a862-d1fbb314e763.jpg?v=1758384326"},{"product_id":"holley-terminator-x-550-905t","title":"Holley Terminator X, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBC, EV6 | 550-905T","description":"\u003cp\u003eThis Terminator X system gives GM Gen IV LS engines (4.8\/5.3\/6.0 truck and LS2\/LS3) real-time fuel learn, high-impedance injector drivers, an integrated 1-bar MAP sensor, and full ignition timing control in one compact, throttle-body-mounted ECU. It ships loaded with base maps for common LS combinations to get a stock engine running quickly, while still offering the tuning depth needed for boosted or nitrous-fed builds. Instead of a handheld display, this kit includes a USB\/CAN tuning cable, with setup and tuning handled through Holley's free Terminator X software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 58x crank, 4x cam signal, and EV6 (USCAR) injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes much of the guesswork from base fuel table tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS injectors and Holley EFI injectors (does not control low-impedance injectors; injector support chart included in instructions)\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor relays AFR data to the ECU for accurate, precise tuning\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-bar MAP sensor with vacuum hose adapters (1\/8in, 1\/4in, and 3\/16in) included\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for pressure sensors, nitrous activation triggers, or a trans-brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, idle air control, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: boost vs. time, boost vs. gear, boost vs. RPM, boost vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel, wet or dry, progressive or non-progressive, with rich\/lean safeties and closed-loop AFR targeting\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced programmable tables: four 1D tables, one 1D per-gear table, four 2D tables, and one 2D per-gear table for custom uses such as a flex-fuel sensor offset table or a fuel\/oil pressure safety\u003c\/li\u003e\n\u003cli\u003eCompact ECU can be mounted virtually anywhere, provided the diagnostic LEDs face up\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and digital\/Pro Dash displays (Holley part numbers 553-106, 553-111, and 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software included for full laptop-based control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: EFI System (Terminator X)\u003c\/li\u003e\n\u003cli\u003eEngine: GM Gen IV LS, 4.8\/5.3\/6.0 Truck \u0026amp; LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, 4x cam\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No (USB\/CAN tuning cable)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1 Bar\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS main harness, EV6 injector harness, ECU, ECU main power harness, Bosch LSU 4.9 wideband O2 sensor, I\/O harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-905T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU is designed to be mounted with its diagnostic LEDs facing up. This kit does not include transmission or drive-by-wire throttle body control — for those features, Holley's Terminator X Max is the step-up option.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the Holley Terminator X 550-905T support?\u003c\/h5\u003e\u003cp\u003eGM Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3 engines with a 58x crank \/ 4x cam signal and EV6 (USCAR) injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld display?\u003c\/h5\u003e\u003cp\u003eNo. This Terminator X kit uses a USB\/CAN tuning cable instead of a handheld, so initial setup and tuning run through Holley's free Terminator X software.\u003c\/p\u003e\u003ch5\u003eWhat kind of injectors will this ECU control?\u003c\/h5\u003e\u003cp\u003eHigh-impedance injector drivers that safely power most stock LS injectors and Holley EFI injectors. It will not control low-impedance injectors; an injector support chart is included in the instructions.\u003c\/p\u003e\u003ch5\u003eCan this ECU control boost or nitrous?\u003c\/h5\u003e\u003cp\u003eYes. It includes boost control strategies (boost vs. time, gear, RPM, and speed, with safeties) and single-channel wet or dry nitrous control, progressive or non-progressive, with AFR safeties.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eWith the diagnostic LEDs facing up, per Holley's installation guidance.\u003c\/p\u003e\u003ch5\u003eDoes the Terminator X support transmission or drive-by-wire control?\u003c\/h5\u003e\u003cp\u003eNo, this version (550-905T) handles fuel and spark only, with no transmission or drive-by-wire throttle body control. Holley's Terminator X Max adds those features.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the Holley Terminator X 550-905T support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3 engines with a 58x crank \/ 4x cam signal and EV6 (USCAR) injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld display?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This Terminator X kit uses a USB\/CAN tuning cable instead of a handheld, so initial setup and tuning run through Holley's free Terminator X software.\"}},{\"@type\":\"Question\",\"name\":\"What kind of injectors will this ECU control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"High-impedance injector drivers that safely power most stock LS injectors and Holley EFI injectors. It will not control low-impedance injectors; an injector support chart is included in the instructions.\"}},{\"@type\":\"Question\",\"name\":\"Can this ECU control boost or nitrous?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It includes boost control strategies (boost vs. time, gear, RPM, and speed, with safeties) and single-channel wet or dry nitrous control, progressive or non-progressive, with AFR safeties.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With the diagnostic LEDs facing up, per Holley's installation guidance.\"}},{\"@type\":\"Question\",\"name\":\"Does the Terminator X support transmission or drive-by-wire control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this version (550-905T) handles fuel and spark only, with no transmission or drive-by-wire throttle body control. Holley's Terminator X Max adds those features.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569478192,"sku":"GVMR_550-905T","price":1449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-w-tuner-cable19277_666d9e87-5d6f-4b8f-8cb6-149af6d4c8be.jpg?v=1758384334"},{"product_id":"holley-terminator-x-gen-iv-truck-ls2-ls3-550-905","title":"Holley Terminator X, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBC, EV6 | 550-905","description":"\u003cp\u003eTerminator X gives GM LS Gen IV truck and LS2\/LS3 engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. It comes fully loaded with base maps for common LS engine combinations to get you on the road fast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 58x crank, 4x cam signal, and EV6 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eMAP sensor vacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs for fans, boost control, nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen IV GM LS Truck \/ LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, Cam Signal: 4x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS Engine Main Harness, EV6 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-905\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-905 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank, 4x cam signal, and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system support?\u003c\/h5\u003e\u003cp\u003eIt's set up for EV6 (USCAR) style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\u003c\/p\u003e\u003ch5\u003eCan I add boost or nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-905 Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM Gen IV LS truck engines (4.8\/5.3\/6.0) and LS2\/LS3 engines with a 58x crank, 4x cam signal, and EV6 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's set up for EV6 (USCAR) style injectors and uses high-impedance injector drivers compatible with most stock 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550-904","description":"\u003cp\u003eTerminator X gives Gen III GM 4.8\/5.3\/6.0 truck engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. It comes fully loaded with base maps for common LS engine combinations to get you on the road fast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 24x crank reluctor and Multec 2 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eMAP sensor vacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs for fans, boost control, nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen III GM Truck (4.8\/5.3\/6.0)\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x, Cam Signal: 1x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Multec 2\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, Multec 2 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-904\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-904 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for Gen III GM 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system support?\u003c\/h5\u003e\u003cp\u003eIt's set up for Multec 2 style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\u003c\/p\u003e\u003ch5\u003eCan I add boost or nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-904 Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Gen III GM 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's set up for Multec 2 style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\"}},{\"@type\":\"Question\",\"name\":\"Can I add boost or nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Terminator X ECU should be mounted with its diagnostic LEDs facing up.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569609264,"sku":"GVMR_550-904","price":1599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/diucjf3u1974_927d802d-7ce7-4b48-af99-8e2398621827.jpg?v=1758384349"},{"product_id":"holley-terminator-x-ls1-ls2-ls6-550-903t","title":"Holley Terminator X, GM LS1\/LS2\/LS6, DBC, EV1 | 550-903T","description":"\u003cp\u003eTerminator X gives GM LS1\/LS6 engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. This kit uses a USB\/CAN tuning cable in place of the handheld and requires the free Terminator X software for initial setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor and EV1 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combos (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)\u003c\/li\u003e\n\u003cli\u003eVacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable for real-time configuration and tuning\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (EV1)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No, USB\/CAN tuning cable included instead\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV1 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-903T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-903T Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV1 (Jetronic\/Minitimer) injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eNo, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\u003c\/p\u003e\u003ch5\u003eCan this system run boosted applications above 1 bar?\u003c\/h5\u003e\u003cp\u003eFor boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\u003c\/p\u003e\u003ch5\u003eCan I add nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\u003c\/p\u003e\u003ch5\u003eWhat's included with the 550-903T kit?\u003c\/h5\u003e\u003cp\u003eIt includes the 24x LS engine main harness, EV1 injector harness, Terminator X ECU, ECU power harness, Bosch LSU 4.9 wideband oxygen sensor, I\/O harness, USB\/CAN tuning cable, and vacuum adapters.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-903T Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV1 (Jetronic\/Minitimer) injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\"}},{\"@type\":\"Question\",\"name\":\"Can this system run boosted applications above 1 bar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\"}},{\"@type\":\"Question\",\"name\":\"Can I add nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\"}},{\"@type\":\"Question\",\"name\":\"What's included with the 550-903T kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It includes the 24x LS engine main harness, EV1 injector harness, Terminator X ECU, ECU power harness, Bosch LSU 4.9 wideband oxygen sensor, I\/O harness, USB\/CAN tuning cable, and vacuum adapters.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418570199088,"sku":"GVMR_550-903T","price":1449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-w-tuner-cable19277_6136e8f0-efc6-4e9e-a4da-998feeaf1042.jpg?v=1758384357"},{"product_id":"holley-terminator-x-ls1-ls2-ls6-550-903","title":"Holley Terminator X, GM LS1\/LS2\/LS6, DBC, EV1 | 550-903","description":"\u003cp\u003eTerminator X gives GM LS1\/LS6 engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. It includes a 3.5 in. touchscreen handheld for calibration and gauge display right out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor and EV1 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combos (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)\u003c\/li\u003e\n\u003cli\u003eVacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\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\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (EV1)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, EV1 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-903\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-903 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV1 (Jetronic\/Minitimer) injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eCan this system run boosted applications above 1 bar?\u003c\/h5\u003e\u003cp\u003eFor boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\u003c\/p\u003e\u003ch5\u003eCan I add nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript 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This kit adds 4R70W transmission control and comes fully loaded with base maps for common Ford V8 combinations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play control for Ford V8 engines such as the 302W, 351W, or 460 Big Block\u003c\/li\u003e\n\u003cli\u003eIncludes Ford-spaced EV1 injector harness and 4R70W (1992-1997) transmission control harness\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eBuilt-in 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.); can be disabled in favor of an external MAP sensor for boosted applications\u003c\/li\u003e\n\u003cli\u003ePlug-and-play ignition compatible with Dual Sync and HyperSpark distributors (558-323 adapter required for HyperSpark)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard for building a base tune quickly\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Ford-spaced EV1)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4R70W (1992-1997)\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: Universal MPFI Main Harness, 4R70W Transmission Control Harness, Ford-Spaced EV1 Injector Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-943\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up. Not recommended for marine applications, but can be used off-road in a dry, protected, heat-shielded location with proper wiring management.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-943 Terminator X Max kit designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for conventional Ford V8 engines such as the 302W, 351W, or 460 Big Block.\u003c\/p\u003e\u003ch5\u003eDoes this kit control the transmission?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 4R70W (1992-1997) transmission control harness in addition to engine control.\u003c\/p\u003e\u003ch5\u003eCan I run a HyperSpark distributor with this system?\u003c\/h5\u003e\u003cp\u003eYes, with the 558-323 adapter; Dual Sync distributors are plug-and-play without an adapter.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard.\u003c\/p\u003e\u003ch5\u003eCan I run this on a boosted application?\u003c\/h5\u003e\u003cp\u003eYes, the internal MAP sensor can be disabled in favor of an external MAP sensor for boosted combinations.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-943 Terminator X Max kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for conventional Ford V8 engines such as the 302W, 351W, or 460 Big Block.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit control the transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 4R70W (1992-1997) transmission control harness in addition to engine control.\"}},{\"@type\":\"Question\",\"name\":\"Can I run a HyperSpark distributor with this system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, with the 558-323 adapter; Dual Sync distributors are plug-and-play without an adapter.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard.\"}},{\"@type\":\"Question\",\"name\":\"Can I run this on a boosted application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, the internal MAP sensor can be disabled in favor of an external MAP sensor for boosted combinations.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418570330160,"sku":"GVMR_550-943","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-94319268.jpg?v=1758384371"},{"product_id":"holley-terminator-x-ford-302-351-460-550-937","title":"Holley Terminator X, Ford 302W\/351W\/460, EV1 | 550-937","description":"\u003cp\u003eTerminator X brings complete standalone engine control to conventional Ford V8 engines like the 302W, 351W, and 460 Big Block, replacing a factory ECU or pre-programmed chip with real-time fuel learn and Holley EFI's race-proven tuning technology. It comes fully loaded with base maps for common Ford V8 combinations to get you on the road fast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play control for Ford V8 engines such as the 302W, 351W, or 460 Big Block\u003c\/li\u003e\n\u003cli\u003eIncludes Ford-spaced EV1 injector harness\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eBuilt-in 1-bar MAP sensor with vacuum hose adapters (1\/8, 1\/4, and 3\/16 in.); can be disabled in favor of an external MAP sensor for boosted applications\u003c\/li\u003e\n\u003cli\u003ePlug-and-play ignition compatible with Dual Sync and HyperSpark distributors (558-323 adapter required for HyperSpark)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard for building a base tune quickly\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Ford-spaced EV1)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: Universal MPFI Main Harness, Ford-Spaced EV1 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-937\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up. If using the factory Ford TPS and IAC sensor, a Ford connector (not supplied) must be wired in.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-937 Terminator X kit designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for conventional Ford V8 engines such as the 302W, 351W, or 460 Big Block.\u003c\/p\u003e\u003ch5\u003eDoes this kit include transmission control?\u003c\/h5\u003e\u003cp\u003eNo, this kit provides engine control only; for transmission control on a 92-97 4R70W, see part number 550-943.\u003c\/p\u003e\u003ch5\u003eCan I run a HyperSpark distributor with this system?\u003c\/h5\u003e\u003cp\u003eYes, with the 558-323 adapter; Dual Sync distributors are plug-and-play without an adapter.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard.\u003c\/p\u003e\u003ch5\u003eDo I need any extra parts to use the factory Ford TPS and IAC sensor?\u003c\/h5\u003e\u003cp\u003eYes, a Ford connector (not supplied) must be wired in to use the factory Ford TPS and IAC sensor.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-937 Terminator X kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for conventional Ford V8 engines such as the 302W, 351W, or 460 Big Block.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include transmission control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit provides engine control only; 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modified or race seats may or may not accommodate the bracket and ECU assembly.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhich Holley EFI ECUs fit this bracket?\u003c\/h5\u003e\u003cp\u003eIt's designed for the HP EFI, Terminator X, and Terminator X Max ECUs.\u003c\/p\u003e\u003ch5\u003eWhere does this bracket mount in the car?\u003c\/h5\u003e\u003cp\u003eIt mounts under the stock passenger seat using the factory seat tracks.\u003c\/p\u003e\u003ch5\u003eWill this work with an aftermarket or race seat?\u003c\/h5\u003e\u003cp\u003eNot necessarily — it's designed around stock seat tracks, and a modified or race seat may not accommodate the bracket and ECU assembly.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Which Holley EFI ECUs fit this bracket?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for the HP EFI, Terminator X, and Terminator X Max ECUs.\"}},{\"@type\":\"Question\",\"name\":\"Where does this bracket mount in the car?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It mounts under the stock passenger seat using the factory seat tracks.\"}},{\"@type\":\"Question\",\"name\":\"Will this work with an aftermarket or race seat?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not necessarily — it's designed around stock seat tracks, and a modified or race seat may not accommodate the bracket and ECU assembly.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418570756144,"sku":"GVMR_554-157","price":116.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/554-157_0119269.jpg?v=1758384400"},{"product_id":"use-with-terminator-x-or-x-max-systems-only-558-132","title":"Holley Gen III HEMI VVT \u0026 SRV Sub Harness, Terminator X\/Terminator X Max | 558-132","description":"\u003cp\u003e2009-and-newer Gen III HEMI engines shipped from the factory with Variable Valve Timing. This plug-and-play sub harness lets a Terminator X or Terminator X Max ECU control and tune the VVT solenoid, and it also includes a pre-wired connector for the factory Short Runner Valve actuator on stock intake manifolds so you can capitalize on its low-RPM torque benefits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: 2009+ Gen III HEMI engines with Variable Valve Timing (VVT)\u003c\/li\u003e\n\u003cli\u003eCompatible ECUs: Terminator X, Terminator X Max only\u003c\/li\u003e\n\u003cli\u003eMinimum software: Terminator X V2.0.50 (Firmware\/Software V2 Build 50)\u003c\/li\u003e\n\u003cli\u003eConnects to: Power Tap and Input\/Output connectors on the Holley EFI HEMI Main Harness\u003c\/li\u003e\n\u003cli\u003eSRV Connector: Pre-wired, plugs directly into the factory Short Runner Valve actuator\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-132\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 558-132 harness control?\u003c\/h5\u003e\u003cp\u003eIt provides plug-and-play control and tuning of the Gen III HEMI's factory Variable Valve Timing (VVT) solenoid.\u003c\/p\u003e\u003ch5\u003eWhich ECUs work with this harness?\u003c\/h5\u003e\u003cp\u003eOnly the Terminator X and Terminator X Max ECUs support this harness.\u003c\/p\u003e\u003ch5\u003eDoes this harness also support the Short Runner Valve?\u003c\/h5\u003e\u003cp\u003eYes, it includes a pre-wired connector that plugs into the factory SRV actuator on stock intake manifolds.\u003c\/p\u003e\u003ch5\u003eWhat software version do I need?\u003c\/h5\u003e\u003cp\u003eYou'll need Terminator X Firmware and Software V2 Build 50 (V2.0.50) or later.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 558-132 harness control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It provides plug-and-play control and tuning of the Gen III HEMI's factory Variable Valve Timing (VVT) solenoid.\"}},{\"@type\":\"Question\",\"name\":\"Which ECUs work with this harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Only the Terminator X and Terminator X Max ECUs support this harness.\"}},{\"@type\":\"Question\",\"name\":\"Does this harness also support the Short Runner Valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a pre-wired connector that plugs into the factory SRV actuator on stock intake manifolds.\"}},{\"@type\":\"Question\",\"name\":\"What software version do I need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"You'll need Terminator X Firmware and Software V2 Build 50 (V2.0.50) or later.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418571083824,"sku":"GVMR_558-132","price":173.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-132_01.jpg?v=1758384437"},{"product_id":"terminator-stealth-2x4-primary-throttle-body-sub-harness-558-459","title":"Holley Terminator Stealth 2x4 Primary Throttle Body Sub Harness, Plug-and-Play Service Harness | 558-459","description":"\u003cp\u003eThis service harness lets a Terminator Stealth 2x4 system operate on a primary throttle body configuration. It functions the same as the standard Terminator Stealth main harness — standard install instructions apply — with the added step of plugging the connector labeled \"Secondary Throttle Body\" into the 2x4 service throttle body. Boosted applications require an external MAP sensor with an appropriate range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePlug-and-play for Primary Terminator Stealth Throttle Body 4150\u003c\/li\u003e\n\u003cli\u003eReplacement\/service part\u003c\/li\u003e\n\u003cli\u003e(9) connectors\u003c\/li\u003e\n\u003cli\u003eWires routed in protective sleeves\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-459\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBoosted setups need an external MAP sensor sized for the application when using this harness.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the 558-459 harness used for?\u003c\/h5\u003e\u003cp\u003eIt's a service harness for the primary throttle body side of a Terminator Stealth 2x4 system, functionally the same as the standard Terminator Stealth main harness.\u003c\/p\u003e\u003ch5\u003eIs any extra wiring step needed during install?\u003c\/h5\u003e\u003cp\u003eYes — plug the connector labeled \"Secondary Throttle Body\" into the 2x4 service throttle body in addition to following the standard Terminator Stealth instructions.\u003c\/p\u003e\u003ch5\u003eDo boosted applications need anything extra?\u003c\/h5\u003e\u003cp\u003eBoosted applications require an external MAP sensor with a range appropriate for the boost level.\u003c\/p\u003e\u003ch5\u003eHow many connectors does the harness include?\u003c\/h5\u003e\u003cp\u003eNine connectors, with wiring routed through protective sleeves.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the 558-459 harness used for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a service harness for the primary throttle body side of a Terminator Stealth 2x4 system, functionally the same as the standard Terminator Stealth main harness.\"}},{\"@type\":\"Question\",\"name\":\"Is any extra wiring step needed during install?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, plug the connector labeled Secondary Throttle Body into the 2x4 service throttle body in addition to following the standard Terminator Stealth instructions.\"}},{\"@type\":\"Question\",\"name\":\"Do boosted applications need anything extra?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Boosted applications require an external MAP sensor with a range appropriate for the boost level.\"}},{\"@type\":\"Question\",\"name\":\"How many connectors does the harness include?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Nine connectors, with wiring routed through protective sleeves.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418572296240,"sku":"GVMR_558-459","price":249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-459_01.jpg?v=1758384480"},{"product_id":"easily-convert-from-single-to-dual-terminator-stealth-558-121","title":"Holley Terminator Stealth 2x4 Main Harness, Single-to-Dual Conversion Kit | 558-121","description":"\u003cp\u003eThis upgrade kit converts a single Terminator Stealth EFI throttle body setup to a dual 2x4 configuration. It includes a new main harness and slave throttle body wiring so an existing Terminator Stealth throttle body can be paired with a second unit — also a clean path for converting a 2x4 supercharged combo to electronic fuel injection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFor 2x4 side-mount Stealth throttle bodies styled after a classic Holley 4150 carburetor\u003c\/li\u003e\n\u003cli\u003eMultiple color options available across the Terminator Stealth EFI line\u003c\/li\u003e\n\u003cli\u003ePlug-and-play main harness for a clean, finished install\u003c\/li\u003e\n\u003cli\u003eLaptop tuning required after installation\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-121\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eHolley recommends having the system tuned by a certified Holley EFI tuner\/installer after this upgrade is installed.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 558-121 kit convert?\u003c\/h5\u003e\u003cp\u003eIt converts a single Terminator Stealth EFI throttle body system to a dual 2x4 setup using the existing throttle body plus a new main harness and slave throttle body.\u003c\/p\u003e\u003ch5\u003eCan this be used to EFI-convert a 2x4 supercharged combo?\u003c\/h5\u003e\u003cp\u003eYes, it's also suited for converting a 2x4 supercharged combination over to electronic fuel injection.\u003c\/p\u003e\u003ch5\u003eIs tuning required after installation?\u003c\/h5\u003e\u003cp\u003eYes, laptop tuning is required, and Holley recommends using a certified Holley EFI tuner\/installer.\u003c\/p\u003e\u003ch5\u003eWhat does the main harness look like installed?\u003c\/h5\u003e\u003cp\u003eIt's a plug-and-play harness designed for a clean, finished appearance in the engine bay.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 558-121 kit convert?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It converts a single Terminator Stealth EFI throttle body system to a dual 2x4 setup using the existing throttle body plus a new main harness and slave throttle body.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used to EFI-convert a 2x4 supercharged combo?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it's also suited for converting a 2x4 supercharged combination over to electronic fuel injection.\"}},{\"@type\":\"Question\",\"name\":\"Is tuning required after installation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, laptop tuning is required, and Holley recommends using a certified Holley EFI tuner or installer.\"}},{\"@type\":\"Question\",\"name\":\"What does the main harness look like installed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a plug-and-play harness designed for a clean, finished appearance in the engine bay.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418572394544,"sku":"GVMR_558-121","price":531.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-121_011922.jpg?v=1758384488"},{"product_id":"for-dominator-hp-and-terminator-x-efi-systems-558-400","title":"Holley J1 A\/B I\/O Auxiliary Harness, For Dominator, HP \u0026 Terminator X | 558-400","description":"\u003cp\u003eThis auxiliary harness connects to the 8-pin Metri-Pack input\/output connector found on most Holley EFI main harnesses, providing four dedicated input wires and four dedicated output wires for Dominator, HP EFI, Terminator X, and Terminator X Max systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConnector: J1 A\/B, 8-pin Metri-Pack\u003c\/li\u003e\n\u003cli\u003e4 input wires, 4 output wires\u003c\/li\u003e\n\u003cli\u003eAssorted wire colors for easy identification\u003c\/li\u003e\n\u003cli\u003eCompatible With: Dominator, HP EFI, Terminator X, Terminator X Max\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-400\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: the Terminator X main harness includes a 3-pin input\/output connector rather than the 8-pin connector this harness is designed for.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat Holley EFI systems does the 558-400 harness work with?\u003c\/h5\u003e\u003cp\u003eDominator, HP EFI, Terminator X, and Terminator X Max.\u003c\/p\u003e\u003ch5\u003eHow many inputs and outputs does it provide?\u003c\/h5\u003e\u003cp\u003eFour input wires and four output wires through an 8-pin Metri-Pack connector.\u003c\/p\u003e\u003ch5\u003eDoes this fit the Terminator X harness the same way?\u003c\/h5\u003e\u003cp\u003eThe Terminator X main harness uses a 3-pin input\/output connector, which differs from the 8-pin connector this harness connects to on other systems.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What Holley EFI systems does the 558-400 harness work with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dominator, HP EFI, Terminator X, and Terminator X Max.\"}},{\"@type\":\"Question\",\"name\":\"How many inputs and outputs does it provide?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Four input wires and four output wires through an 8-pin Metri-Pack connector.\"}},{\"@type\":\"Question\",\"name\":\"Does this fit the Terminator X harness the same way?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Terminator X main harness uses a 3-pin input\/output connector, which differs from the 8-pin connector this harness connects to on other systems.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418573344816,"sku":"GVMR_558-400","price":135.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-400_01.jpg?v=1758384594"},{"product_id":"holley-terminator-x-max-gen-iii-truck-550-917","title":"Holley Terminator X Max, GM Gen III 4.8\/5.3\/6.0 Truck, DBC, Multec 2, 4L60E\/4L80E | 550-917","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS Gen III 4.8\/5.3\/6.0 truck engine in one compact, throttle-body-mounted ECU. It replaces a cumbersome junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology at a budget-friendly price, plus 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS 4.8\/5.3\/6.0 truck engines with 24x crank reluctor, Multec 2 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) and 4 programmable outputs (ground, PWM) for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control: boost vs. time, gear, RPM, and speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel wet or dry, progressive or non-progressive, with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced custom tables for flex-fuel offset, fuel\/oil pressure safeties, and more\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, Multec 2 injector harness, 4L60E\/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I\/O harness, and vacuum adapters\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen III GM Truck (4.8\/5.3\/6.0)\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: Multec 2\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-917\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-917 Terminator X Max fit?\u003c\/h5\u003e\u003cp\u003eGM LS Gen III 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it control the transmission?\u003c\/h5\u003e\u003cp\u003eYes, it includes 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and customizable gauges is included.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 truck?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eWhat MAP sensor does it use?\u003c\/h5\u003e\u003cp\u003eAn on-board 1-bar MAP sensor, ideal for naturally aspirated or nitrous combinations.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-917 Terminator X Max fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS Gen III 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it control the transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes 4L60E\/4L80E transmission control.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and customizable gauges is included.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a 4x4 truck?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"What MAP sensor does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An on-board 1-bar MAP sensor, ideal for naturally aspirated or nitrous combinations.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574196784,"sku":"GVMR_550-917","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/1b87247376c8bb4942c39145e742ee40744b720a.jpg?v=1758384695"},{"product_id":"holley-terminator-x-max-gen-iii-truck-dbw-550-927","title":"Holley Terminator X Max, GM Gen III 4.8\/5.3\/6.0 Truck, DBW, Multec 2, 4L60E\/4L80E | 550-927","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS Gen III 4.8\/5.3\/6.0 truck engine in one compact, throttle-body-mounted ECU. It replaces a cumbersome junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E\/4L80E transmission control and drive-by-wire throttle body control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS 4.8\/5.3\/6.0 truck engines with 24x crank reluctor, Multec 2 injectors, transmission control, and drive-by-wire throttle body control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control: boost vs. time, gear, RPM, and speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel wet or dry, progressive or non-progressive, with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eAdvanced custom tables for flex-fuel offset, fuel\/oil pressure safeties, and more\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eRecommended pedal part number 10379038 for DBW setup\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, Multec 2 injector harness, DBW throttle body harness, 4L60E\/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I\/O harness\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen III GM Truck (4.8\/5.3\/6.0)\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: Multec 2\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-927\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection. Recommended pedal part number is 10379038.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat makes 550-927 different from 550-917?\u003c\/h5\u003e\u003cp\u003e550-927 adds drive-by-wire throttle body control on top of 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003ch5\u003eWhat engines does it fit?\u003c\/h5\u003e\u003cp\u003eGM LS Gen III 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard is included.\u003c\/p\u003e\u003ch5\u003eIs a gas pedal included?\u003c\/h5\u003e\u003cp\u003eNo — the recommended pedal is part number 10379038, sold separately.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 truck?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What makes 550-927 different from 550-917?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"550-927 adds drive-by-wire throttle body control on top of 4L60E\/4L80E transmission control.\"}},{\"@type\":\"Question\",\"name\":\"What engines does it fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS Gen III 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard is included.\"}},{\"@type\":\"Question\",\"name\":\"Is a gas pedal included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the recommended pedal is part number 10379038, sold separately.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a 4x4 truck?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574295088,"sku":"GVMR_550-927","price":2199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974_50cca43c-251d-4ac2-a2d2-147e3451b723.jpg?v=1758384704"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-926t","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBW, EV1, 4L60E\/4L80E | 550-926T","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS1\/LS6 engine in one compact ECU. It replaces a cumbersome junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E\/4L80E transmission control and drive-by-wire throttle body control. This kit includes a USB\/CAN tuning cable in place of the 3.5 in. handheld and uses the free Terminator X software for setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS1\/LS6 engines with 24x crank reluctor, EV1 injectors, 4L60E\/4L80E transmission control, and drive-by-wire throttle body control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control and nitrous control tables, plus advanced custom tables for flex-fuel offset and pressure safeties\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable for real-time configuration and tuning via laptop\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eRecommended pedal part number 10379038\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, EV1 injector harness, DBW throttle body harness, 4L60E\/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I\/O harness\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\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 EV1)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: Yes\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No — USB\/CAN tuning cable instead\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-926T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes 550-926T include a handheld display?\u003c\/h5\u003e\u003cp\u003eNo — this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\u003c\/p\u003e\u003ch5\u003eWhat engines does it fit?\u003c\/h5\u003e\u003cp\u003eGM LS1\/LS6 engines with a 24x crank reluctor and EV1 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it control the transmission and throttle body?\u003c\/h5\u003e\u003cp\u003eYes, it includes 4L60E\/4L80E transmission control and drive-by-wire throttle body control.\u003c\/p\u003e\u003ch5\u003eIs a gas pedal included?\u003c\/h5\u003e\u003cp\u003eNo — the recommended pedal is part number 10379038, sold separately.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does 550-926T include a handheld display?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit includes a USB\/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.\"}},{\"@type\":\"Question\",\"name\":\"What engines does it fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS1\/LS6 engines with a 24x crank reluctor and EV1 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it control the transmission and throttle body?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes 4L60E\/4L80E transmission control and drive-by-wire throttle body control.\"}},{\"@type\":\"Question\",\"name\":\"Is a gas pedal included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the recommended pedal is part number 10379038, sold separately.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574360624,"sku":"GVMR_550-926T","price":2149.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-max-w-tuner-cable19277_d7d257bc-f3e8-4c63-9f18-bbe3a4c03735.jpg?v=1758384711"},{"product_id":"holley-terminator-x-ls1-ls2-ls6-ev6-550-909","title":"Holley Terminator X, GM LS1\/LS2\/LS6, DBC, EV6 | 550-909","description":"\u003cp\u003eTerminator X puts complete control of a GM LS1\/LS6 engine in one compact ECU, replacing a junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology at a budget-friendly price.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS1\/LS6 engines with 24x crank reluctor and EV6 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for pressure sensors, nitrous activation, or a trans brake\u003c\/li\u003e\n\u003cli\u003eBoost control and nitrous control tables, plus advanced custom tables\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, EV6 injector harness, ECU, main power harness, wideband oxygen sensor, I\/O harness, and vacuum adapters\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\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: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-909\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does 550-909 fit?\u003c\/h5\u003e\u003cp\u003eGM LS1\/LS6 engines with a 24x crank reluctor and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it include transmission control?\u003c\/h5\u003e\u003cp\u003eNo, this version has no transmission control — fuel and spark only.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard is included.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eWith the diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does 550-909 fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS1\/LS6 engines with a 24x crank reluctor and EV6 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it include transmission control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this version has no transmission control, fuel and spark only.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard is included.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With the diagnostic LEDs facing up.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574426160,"sku":"GVMR_550-909","price":1599.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/diucjf3u1974_e4c2cb7c-f1f1-4ced-9357-49aa25c2d907.jpg?v=1758384719"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-919t","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBC, EV6, 4L60E\/4L80E | 550-919T","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS1\/LS6 engine in one compact ECU, replacing a junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E\/4L80E transmission control. This kit includes a USB\/CAN tuning cable in place of the 3.5 in. handheld and uses the free Terminator X software for setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS1\/LS6 engines with 24x crank reluctor, EV6 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control and nitrous control tables, plus advanced custom tables\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes USB\/CAN tuning cable for real-time configuration and tuning via laptop\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, EV6 injector harness, 4L60E\/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I\/O harness, and vacuum adapters\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\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: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No — USB\/CAN tuning cable instead\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-919T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's the difference between 550-919T and 550-919?\u003c\/h5\u003e\u003cp\u003e550-919T uses a USB\/CAN tuning cable and the free Terminator X software instead of the 3.5 in. touchscreen handheld included with 550-919.\u003c\/p\u003e\u003ch5\u003eWhat engines does it fit?\u003c\/h5\u003e\u003cp\u003eGM LS1\/LS6 engines with a 24x crank reluctor and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it control the transmission?\u003c\/h5\u003e\u003cp\u003eYes, it includes 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003cscript 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EFI","offers":[{"title":"Default Title","offer_id":42418574491696,"sku":"GVMR_550-919T","price":1949.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-max-w-tuner-cable19277_c595d6a9-d97e-4deb-a7ab-12f971d46241.jpg?v=1758384726"},{"product_id":"holley-terminator-x-max-ls1-ls2-ls6-550-919","title":"Holley Terminator X Max, GM LS1\/LS2\/LS6, DBC, EV6, 4L60E\/4L80E | 550-919","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS1\/LS6 engine in one compact ECU, replacing a junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS1\/LS6 engines with 24x crank reluctor, EV6 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control and nitrous control tables, plus advanced custom tables\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003cli\u003eIncludes 24x LS main harness, EV6 injector harness, 4L60E\/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I\/O harness, and vacuum adapters\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\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: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-919\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does 550-919 fit?\u003c\/h5\u003e\u003cp\u003eGM LS1\/LS6 engines with a 24x crank reluctor and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and customizable gauges.\u003c\/p\u003e\u003ch5\u003eDoes it control the transmission?\u003c\/h5\u003e\u003cp\u003eYes, it includes 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does 550-919 fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS1\/LS6 engines with a 24x crank reluctor and EV6 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and customizable gauges.\"}},{\"@type\":\"Question\",\"name\":\"Does it control the transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes 4L60E\/4L80E transmission control.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574590000,"sku":"GVMR_550-919","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v419741986_389abb34-174c-4da3-b7d3-a13a194b08c1.jpg?v=1758384735"},{"product_id":"holley-terminator-x-max-gen-iv-truck-ls2-ls3-550-918","title":"Holley Terminator X Max, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, EV6, 4L60E\/4L80E | 550-918","description":"\u003cp\u003eTerminator X Max puts complete control of a GM LS Gen IV 4.8\/5.3\/6.0 truck engine or LS2\/LS3 in one compact ECU, replacing a junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3 with 58x crank, 4x cam, EV6 injectors, and 4L60E\/4L80E transmission control\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003eBoost control and nitrous control tables, plus advanced custom tables\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (diagnostic LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen IV GM Truck 4.8\/5.3\/6.0 and LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, 4x Cam\u003c\/li\u003e\n\u003cli\u003eInjector Connector: EV6\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-918\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does 550-918 fit?\u003c\/h5\u003e\u003cp\u003eGM LS Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3, with a 58x crank\/4x cam reluctor and EV6 injectors.\u003c\/p\u003e\u003ch5\u003eDoes it control the transmission?\u003c\/h5\u003e\u003cp\u003eYes, it includes 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard.\u003c\/p\u003e\u003ch5\u003eCan this be used on a 4x4 vehicle?\u003c\/h5\u003e\u003cp\u003eIt's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does 550-918 fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM LS Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3, with a 58x crank\/4x cam reluctor and EV6 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it control the transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes 4L60E\/4L80E transmission control.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a 4x4 vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's not recommended for 4x4 applications with electronic transfer cases.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574655536,"sku":"GVMR_550-918","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/terminatorxmax_v41974_973e8098-fa25-42c5-8e1d-e762dc57cb91.jpg?v=1758384743"},{"product_id":"holley-terminator-x-max-universal-mpfi-550-942","title":"Holley Terminator X Max, Universal V8, EV1, 4L60E\/4L80E | 550-942","description":"\u003cp\u003eTerminator X Max brings complete engine control to any V8 with a universal MPFI harness, replacing a factory ECU's cumbersome tuning interface with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus GM 4L60E\/4L80E transmission control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUniversal MPFI main harness for common V8 engine combinations\u003c\/li\u003e\n\u003cli\u003eGM 4L60E\/4L80E transmission control included\u003c\/li\u003e\n\u003cli\u003eEV1-style injector connectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn takes the guesswork out of tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control\u003c\/li\u003e\n\u003cli\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combinations\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs and 4 programmable outputs for fans, boost control, nitrous, and more\u003c\/li\u003e\n\u003cli\u003e3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital\/pro dashes\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop access\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: Universal — fits common V8 engine combinations via a universal MPFI main harness, not a specific factory\/LS-style harness\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Universal\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (Bosch EV1)\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar\u003c\/li\u003e\n\u003cli\u003eTransmission Control: 4L60E\/4L80E\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-942\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot compatible with 4L6X transmissions from model year 1995 or earlier due to converter lockup and downshift strategy changes. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat kind of engine is 550-942 designed for?\u003c\/h5\u003e\u003cp\u003eIt's a universal MPFI kit built for common V8 engine combinations, not a specific factory harness like the LS-specific Terminator X Max kits.\u003c\/p\u003e\u003ch5\u003eDoes it include transmission control?\u003c\/h5\u003e\u003cp\u003eYes, GM 4L60E\/4L80E transmission control is included.\u003c\/p\u003e\u003ch5\u003eIs a handheld tuner included?\u003c\/h5\u003e\u003cp\u003eYes, a 3.5 in. touchscreen handheld with a calibration wizard.\u003c\/p\u003e\u003ch5\u003eWhat injector connector does it use?\u003c\/h5\u003e\u003cp\u003eJetronic\/Minitimer (Bosch EV1) style connectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What kind of engine is 550-942 designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a universal MPFI kit built for common V8 engine combinations, not a specific factory harness like the LS-specific Terminator X Max kits.\"}},{\"@type\":\"Question\",\"name\":\"Does it include transmission control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, GM 4L60E\/4L80E transmission control is included.\"}},{\"@type\":\"Question\",\"name\":\"Is a handheld tuner included?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, a 3.5 in. touchscreen handheld with a calibration wizard.\"}},{\"@type\":\"Question\",\"name\":\"What injector connector does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Jetronic\/Minitimer (Bosch EV1) style connectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418574721072,"sku":"GVMR_550-942","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-94219268.jpg?v=1758384750"},{"product_id":"terminator-efi-input-output-kit-558-420","title":"Holley Terminator EFI Input\/Output Kit, 4 Extra Input Wires + 1 Output Wire | 558-420","description":"\u003cp\u003eThe Terminator EFI Input\/Output Kit adds 5 extra input\/output wires beyond what the base Terminator EFI harness provides — four input wires for Inputs 1-4 and one output wire for Output 2. These extra channels can be programmed for additional features and functions through Holley EFI laptop software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Terminator Input\/Output Wiring Harness\u003c\/li\u003e\n\u003cli\u003eIncludes: 4 input wires (Inputs 1-4), 1 output wire (Output 2)\u003c\/li\u003e\n\u003cli\u003eProgramming: Configured via Holley EFI laptop software\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-420\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRequires Holley EFI laptop software to program the added input\/output functions.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 558-420 I\/O kit add to a Terminator EFI harness?\u003c\/h5\u003e\u003cp\u003eIt adds four extra input wires covering Inputs 1-4 and one extra output wire for Output 2 that aren't included on the base Terminator EFI harness.\u003c\/p\u003e\u003ch5\u003eHow do I set up the added inputs and outputs?\u003c\/h5\u003e\u003cp\u003eThese channels are programmed through Holley EFI laptop software, which also includes instructions for configuring them.\u003c\/p\u003e\u003ch5\u003eWhat part number is this kit?\u003c\/h5\u003e\u003cp\u003eThis is Holley part number 558-420.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 558-420 I\/O kit add to a Terminator EFI harness?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adds four extra input wires covering Inputs 1-4 and one extra output wire for Output 2 that aren't included on the base Terminator EFI harness.\"}},{\"@type\":\"Question\",\"name\":\"How do I set up the added inputs and outputs?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These channels are programmed through Holley EFI laptop software, which also includes instructions for configuring them.\"}},{\"@type\":\"Question\",\"name\":\"What part number is this kit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This is Holley part number 558-420.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418575966256,"sku":"GVMR_558-420","price":56.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-420_01.jpg?v=1758384878"},{"product_id":"replacement-main-wiring-harness-for-terminator-efi-kits-550-405-and-550-406-558-414","title":"Holley Terminator Main Harness, For 550-405 \u0026 550-406 4150 TBI EFI Kits | 558-414","description":"\u003cp\u003eThis replacement main harness is built for Terminator EFI installations using 4-barrel throttle body fuel injection systems. It's designed specifically for use with Holley part numbers 550-405 and 550-406.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Terminator TBI Main Engine Harness\u003c\/li\u003e\n\u003cli\u003eCompatible With: Holley 550-405 and 550-406 Terminator EFI kits\u003c\/li\u003e\n\u003cli\u003eConstruction: Connectors and unterminated wires with protective sleeving\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-414\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRecommended for use on Holley part numbers 550-405 and 550-406.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat kits is the 558-414 harness designed for?\u003c\/h5\u003e\u003cp\u003eIt's a replacement main harness built specifically for Holley Terminator EFI kits 550-405 and 550-406.\u003c\/p\u003e\u003ch5\u003eWhat type of fuel injection system does it support?\u003c\/h5\u003e\u003cp\u003eIt's designed for 4-barrel throttle body fuel injection (TBI) systems.\u003c\/p\u003e\u003ch5\u003eDoes it include connectors?\u003c\/h5\u003e\u003cp\u003eYes, it includes connectors along with unterminated wires and protective sleeving.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What kits is the 558-414 harness designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's a replacement main harness built specifically for Holley Terminator EFI kits 550-405 and 550-406.\"}},{\"@type\":\"Question\",\"name\":\"What type of fuel injection system does it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for 4-barrel throttle body fuel injection (TBI) systems.\"}},{\"@type\":\"Question\",\"name\":\"Does it include connectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes connectors along with unterminated wires and protective sleeving.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418576031792,"sku":"GVMR_558-414","price":531.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-414_01.jpg?v=1758384885"},{"product_id":"sniper-efi-or-terminator-x-558-465","title":"Holley EFI CAN Splitter, For HP, Dominator, Sniper 1 \u0026 Terminator X | 558-465","description":"\u003cp\u003eThe Holley EFI CAN splitter lets you add an additional CAN device to an HP, Dominator, Sniper 1, or Terminator X installation without unplugging the handheld. It plugs directly into the CAN connector on the main harness, freeing up a port for a Digital Dash, USB-to-CAN communication cable, or other Holley EFI CAN device.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: CAN Extension Harness\u003c\/li\u003e\n\u003cli\u003eCompatibility: HP, Dominator, Sniper 1, Terminator X\u003c\/li\u003e\n\u003cli\u003eConnectors: 3\u003c\/li\u003e\n\u003cli\u003eConstruction: Wires in protective sleeve\u003c\/li\u003e\n\u003cli\u003ePart Number: 558-465\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUnplug the CAN Splitter from the main harness before updating ECU firmware — plug the firmware-updating device directly into the main harness instead to prevent damage.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does the 558-465 CAN splitter do?\u003c\/h5\u003e\u003cp\u003eIt lets you add an additional CAN device — like a Digital Dash or USB-to-CAN cable — to your installation without needing to unplug the handheld.\u003c\/p\u003e\u003ch5\u003eWhich Holley EFI systems is it compatible with?\u003c\/h5\u003e\u003cp\u003eHP, Dominator, Sniper 1, and Terminator X.\u003c\/p\u003e\u003ch5\u003eDo I need to remove it when updating ECU firmware?\u003c\/h5\u003e\u003cp\u003eYes. Unplug the CAN Splitter from the main harness and plug the firmware-updating device directly into the main harness to avoid damage.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does the 558-465 CAN splitter do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It lets you add an additional CAN device — like a Digital Dash or USB-to-CAN cable — to your installation without needing to unplug the handheld.\"}},{\"@type\":\"Question\",\"name\":\"Which Holley EFI systems is it compatible with?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"HP, Dominator, Sniper 1, and Terminator X.\"}},{\"@type\":\"Question\",\"name\":\"Do I need to remove it when updating ECU firmware?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Unplug the CAN Splitter from the main harness and plug the firmware-updating device directly into the main harness to avoid damage.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579243056,"sku":"GVMR_558-465","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/558-465_01.jpg?v=1758384945"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-four-522-205","title":"Holley Terminator X Fuel Injectors, Bosch\/EV14, 205 lb\/hr, Set of Four | 522-205","description":"\u003cp\u003eThese Holley EFI fuel injectors feature a precision lapped disc valve, high-quality brass windings, and high-temp O-rings for excellent linearity without the pulse-width bounce common to other injectors. This 205 lb\/hr Bosch\/EV14 set delivers precision, dependable fuel delivery for high-output builds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Four\u003c\/li\u003e\n\u003cli\u003eBody Style: EV14, Bosch\/EV14 connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 205 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 2.85 in.\u003c\/li\u003e\n\u003cli\u003eLength: 40mm\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 2.415 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-205\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSupports up to 2600 HP when running a full set of eight. Maximum recommended fuel pressure is 75 PSI. 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Sold individually, it's rated at 48 lb\/hr with a tri-cone spray pattern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector, Individual\u003c\/li\u003e\n\u003cli\u003eBody Style: EV1, Bosch style connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 48 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 2.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 2.415 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-481\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (commonly called LS3-style), featuring a USCAR connector and 14mm o-rings on both ends. It's an ideal fit for Holley EFI intake manifolds with fuel rail brackets for shorter LS3\/LS7 length injectors; in manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the rated flow of the 522-481 injector?\u003c\/h5\u003e\u003cp\u003e48 lb\/hr at 43 PSI base fuel pressure, high impedance (12.2 Ohm).\u003c\/p\u003e\u003ch5\u003eWhat spray pattern does it use?\u003c\/h5\u003e\u003cp\u003eA tri-cone spray pattern for consistent atomization.\u003c\/p\u003e\u003ch5\u003eDoes this fit standard LS3\/LS7 manifolds?\u003c\/h5\u003e\u003cp\u003eIt's designed for the shorter LS3-style 38mm o-ring seat spacing; in manifolds built for factory LS3\/LS7 injectors, the bottom o-ring needs to be swapped for proper fitment.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the rated flow of the 522-481 injector?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"48 lb\/hr at 43 PSI base fuel pressure, high impedance (12.2 Ohm).\"}},{\"@type\":\"Question\",\"name\":\"What spray pattern does it use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A tri-cone spray pattern for consistent atomization.\"}},{\"@type\":\"Question\",\"name\":\"Does this fit standard LS3\/LS7 manifolds?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's designed for the shorter LS3-style 38mm o-ring seat spacing; in manifolds built for factory LS3\/LS7 injectors, the bottom o-ring needs to be swapped for proper fitment.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579505200,"sku":"GVMR_522-481","price":99.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/injector1_ffcdf346-474d-498c-ad88-6fef05615d8a.jpg?v=1758384975"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-eight-522-228xfm","title":"Holley Terminator X Fuel Injectors, PICO\/EV6, 220 lb\/hr, Flow Matched Set of Eight | 522-228XFM","description":"\u003cp\u003eThese Terminator X fuel injectors are dynamically flow matched within 1% for extremely consistent injector characteristics and excellent linearity without the low pulse-width bounce seen in other injectors. Available across a wide range of flow rates, this 220 lb\/hr set works with any ECU using high impedance fuel injector drivers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Eight, Flow Matched (within 1%)\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, USCAR connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 220 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline, Methanol\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-228XFM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (LS3 style), with a USCAR connector and 14mm o-rings on both ends. In manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does flow matched mean for these injectors?\u003c\/h5\u003e\u003cp\u003eThe 522-228XFM set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\u003c\/p\u003e\u003ch5\u003eWhat is the rated flow?\u003c\/h5\u003e\u003cp\u003e220 lb\/hr at 43 PSI base fuel pressure, high impedance.\u003c\/p\u003e\u003ch5\u003eCan this be used on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003ch5\u003eWhat fuels are these injectors rated for?\u003c\/h5\u003e\u003cp\u003eE-85, gasoline, and methanol.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does flow matched mean for these injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 522-228XFM set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\"}},{\"@type\":\"Question\",\"name\":\"What is the rated flow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"220 lb\/hr at 43 PSI base fuel pressure, high impedance.\"}},{\"@type\":\"Question\",\"name\":\"Can this be used on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}},{\"@type\":\"Question\",\"name\":\"What fuels are these injectors rated for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"E-85, gasoline, and methanol.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579570736,"sku":"GVMR_522-228XFM","price":1049.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-228x.jpg?v=1758384982"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-eight-522-228x","title":"Holley Terminator X Fuel Injectors, PICO\/EV6, 220 lb\/hr, Set of Eight | 522-228X","description":"\u003cp\u003eTerminator X high impedance fuel injectors feature a precision lapped disc valve, high-quality brass windings, and high-temp o-rings for excellent linearity without the low pulse-width bounce seen in other injectors. This 220 lb\/hr set works with any ECU using high impedance fuel injector drivers and is methanol compatible for extreme horsepower applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Eight\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, USCAR connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 220 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline, Methanol\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-228X\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRated at 43 PSI base fuel pressure — high base fuel pressure is not recommended. Designed for setups with a 38mm distance between o-ring seats (LS3-style), with a USCAR connector and 14mm o-rings on both ends; in manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the rated flow of the 522-228X injectors?\u003c\/h5\u003e\u003cp\u003e220 lb\/hr at 43 PSI base fuel pressure, sold as a set of eight.\u003c\/p\u003e\u003ch5\u003eAre these injectors methanol compatible?\u003c\/h5\u003e\u003cp\u003eYes, they're rated for E-85, gasoline, and methanol — suited to extreme horsepower applications.\u003c\/p\u003e\u003ch5\u003eCan this be installed on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the rated flow of the 522-228X injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"220 lb\/hr at 43 PSI base fuel pressure, sold as a set of eight.\"}},{\"@type\":\"Question\",\"name\":\"Are these injectors methanol compatible?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, they're rated for E-85, gasoline, and methanol — suited to extreme horsepower applications.\"}},{\"@type\":\"Question\",\"name\":\"Can this be installed on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579636272,"sku":"GVMR_522-228X","price":849.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-228x_6456037a-4be3-4148-8b60-ac762adb1544.jpg?v=1758384989"},{"product_id":"holley-terminator-x-fuel-injector-individual-522-361s","title":"Holley Terminator X Fuel Injector, PICO\/EV6, 36 lb\/hr, Individual | 522-361S","description":"\u003cp\u003eThis Holley EFI fuel injector features a precision lapped disc valve, high-quality brass windings, and high-temp O-rings for excellent linearity without the low pulse-width bounce common in other injectors. Sold individually, it's rated at 36 lb\/hr and intended for use with the 300-260 intake manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector, Individual\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, PICO\/EV6 connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 36 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-361S\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIntended for use with the 300-260 intake manifold; not a service injector for the Sniper EFI TBI product line. Designed for setups with a 38mm distance between o-ring seats (LS3-style), with a USCAR connector and 14mm o-rings on both ends.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat manifold is the 522-361S injector designed for?\u003c\/h5\u003e\u003cp\u003eIt's intended for use with the Holley 300-260 intake manifold and is not a service injector for the Sniper EFI TBI product line.\u003c\/p\u003e\u003ch5\u003eWhat is the rated flow?\u003c\/h5\u003e\u003cp\u003e36 lb\/hr at 43 PSI base fuel pressure, supporting up to 575 HP in a set of eight.\u003c\/p\u003e\u003ch5\u003eCan this be installed on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What manifold is the 522-361S injector designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's intended for use with the Holley 300-260 intake manifold and is not a service injector for the Sniper EFI TBI product line.\"}},{\"@type\":\"Question\",\"name\":\"What is the rated flow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"36 lb\/hr at 43 PSI base fuel pressure, supporting up to 575 HP in a set of eight.\"}},{\"@type\":\"Question\",\"name\":\"Can this be installed on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579701808,"sku":"GVMR_522-361S","price":92.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-368s_v11928.jpg?v=1758384997"},{"product_id":"pico-ev6-76-lb-hr-high-impedance-flow-matched-522-768xfm","title":"Holley Terminator X Fuel Injectors, PICO\/EV6, 76 lb\/hr, Flow Matched Set of Eight | 522-768XFM","description":"\u003cp\u003eThese Terminator X fuel injectors are dynamically flow matched within 1% for extremely consistent injector characteristics and excellent linearity without the low pulse-width bounce seen in other injectors. This 76 lb\/hr set works with any ECU using high impedance fuel injector drivers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Eight, Flow Matched (within 1%)\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, USCAR connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 76 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-768XFM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (LS3-style), with a USCAR connector and 14mm o-rings on both ends. In manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does flow matched mean for the 522-768XFM injectors?\u003c\/h5\u003e\u003cp\u003eThis set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\u003c\/p\u003e\u003ch5\u003eWhat is the rated flow?\u003c\/h5\u003e\u003cp\u003e76 lb\/hr, part of a range from 42 to 220 lb\/hr in the Terminator X flow matched lineup.\u003c\/p\u003e\u003ch5\u003eCan this be installed on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does flow matched mean for the 522-768XFM injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\"}},{\"@type\":\"Question\",\"name\":\"What is the rated flow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"76 lb\/hr, part of a range from 42 to 220 lb\/hr in the Terminator X flow matched lineup.\"}},{\"@type\":\"Question\",\"name\":\"Can this be installed on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418579963952,"sku":"GVMR_522-768XFM","price":727.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-768x.jpg?v=1758385027"},{"product_id":"pico-ev6-42-lb-hr-high-impedance-flow-matched-522-428xfm","title":"Holley Terminator X Fuel Injectors, PICO\/EV6, 42 lb\/hr, Flow Matched Set of Eight | 522-428XFM","description":"\u003cp\u003eThese Terminator X fuel injectors are dynamically flow matched within 1% for extremely consistent injector characteristics and excellent linearity without the low pulse-width bounce seen in other injectors. This 42 lb\/hr set works with any ECU using high impedance fuel injector drivers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Eight, Flow Matched (within 1%)\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, USCAR connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 42 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-428XFM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (LS3-style), with a USCAR connector and 14mm o-rings on both ends. In manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat does flow matched mean for the 522-428XFM injectors?\u003c\/h5\u003e\u003cp\u003eThis set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\u003c\/p\u003e\u003ch5\u003eWhat is the rated flow?\u003c\/h5\u003e\u003cp\u003e42 lb\/hr, the lowest offering in the Terminator X flow matched lineup, which ranges up to 220 lb\/hr.\u003c\/p\u003e\u003ch5\u003eCan this be installed on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does flow matched mean for the 522-428XFM injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This set is dynamically flow matched within 1%, ensuring consistent fueling across all eight injectors.\"}},{\"@type\":\"Question\",\"name\":\"What is the rated flow?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"42 lb\/hr, the lowest offering in the Terminator X flow matched lineup, which ranges up to 220 lb\/hr.\"}},{\"@type\":\"Question\",\"name\":\"Can this be installed on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418580029488,"sku":"GVMR_522-428XFM","price":779.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-428x.jpg?v=1758385036"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-eight-522-108x","title":"Holley Terminator X Fuel Injectors, PICO\/EV6, 100 lb\/hr, Set of Eight | 522-108X","description":"\u003cp\u003eTerminator X high impedance fuel injectors feature a precision lapped disc valve, high-quality brass windings, and high-temp o-rings for excellent linearity without the low pulse-width bounce seen in other injectors. This 100 lb\/hr set works with any ECU using high impedance fuel injector drivers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Fuel Injector Set of Eight\u003c\/li\u003e\n\u003cli\u003eBody Style: EV6, USCAR connector\u003c\/li\u003e\n\u003cli\u003eRated Flow: 100 lb\/hr\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85 in.\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421 in.\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-108X\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (LS3-style), with a USCAR connector and 14mm o-rings on both ends. In manifolds designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the rated flow of the 522-108X injectors?\u003c\/h5\u003e\u003cp\u003e100 lb\/hr at 60 PSI base fuel pressure, sold as a set of eight.\u003c\/p\u003e\u003ch5\u003eWhat connector do these injectors use?\u003c\/h5\u003e\u003cp\u003eA USCAR EV6 connector, high impedance for saturated drivers.\u003c\/p\u003e\u003ch5\u003eCan this be installed on a street-driven, emissions-controlled vehicle?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the rated flow of the 522-108X injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"100 lb\/hr at 60 PSI base fuel pressure, sold as a set of eight.\"}},{\"@type\":\"Question\",\"name\":\"What connector do these injectors use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A USCAR EV6 connector, high impedance for saturated drivers.\"}},{\"@type\":\"Question\",\"name\":\"Can this be installed on a street-driven, emissions-controlled vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal only for Racing Use Only vehicles that are not registered or operated on the street.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418580357168,"sku":"GVMR_522-108X","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-108x.jpg?v=1758385042"},{"product_id":"pico-ev6-100-lb-hr-high-impedance-flow-matched-522-108xfm","title":"Holley Terminator X Fuel Injectors, Set of Eight, 100 lb\/hr High-Impedance Flow-Matched | 522-108XFM","description":"\u003cp\u003eHolley Terminator X fuel injectors are dynamically flow matched within 1% for precise, consistent injector characteristics with smooth linearity and no bounce at low pulse widths. Offered from 42 lb\/hr to 220 lb\/hr, this PICO\/EV6-style set is built for non-emissions-controlled applications and works with any ECU that uses high-impedance fuel injector drivers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBody Style: PICO\/EV6\u003c\/li\u003e\n\u003cli\u003eBody Diameter: 0.65\"\u003c\/li\u003e\n\u003cli\u003eBody Length: 1.85\"\u003c\/li\u003e\n\u003cli\u003eO-Ring to O-Ring: 1.421\"\u003c\/li\u003e\n\u003cli\u003eConnector Series: USCAR - EV6\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eRated Injector Flow: 100 lb\/hr\u003c\/li\u003e\n\u003cli\u003eFuel Type: E-85, Gasoline\u003c\/li\u003e\n\u003cli\u003eKit Contents: Set of 8 injectors\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-108XFM\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for installs with a 38mm distance between the o-ring seats on the fuel rail and intake manifold (commonly called an \"LS3 style\" injector), this set uses a USCAR connector with 14mm o-rings on both ends. It's a good fit for Holley EFI intake manifolds with fuel rail brackets for shorter LS3\/LS7-length injectors; when used in a manifold designed for factory LS3\/LS7 injectors, the bottom o-ring should be replaced for proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat flow rate are these injectors rated at?\u003c\/h5\u003e\u003cp\u003eThis set is rated at 100 lb\/hr, dynamically flow matched within 1% for consistent performance across all eight injectors.\u003c\/p\u003e\u003ch5\u003eWhat connector style do these injectors use?\u003c\/h5\u003e\u003cp\u003eThey use a PICO\/EV6-style USCAR connector with 14mm o-rings on both ends.\u003c\/p\u003e\u003ch5\u003eCan these be used with any ECU?\u003c\/h5\u003e\u003cp\u003eYes, these high-impedance injectors work with any ECU that uses high-impedance (saturated) fuel injector drivers, not just Holley EFI systems.\u003c\/p\u003e\u003ch5\u003eAre these legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. This part is legal for sale and use on Racing Use Only Vehicles only — see the compliance note above.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What flow rate are these injectors rated at?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This set is rated at 100 lb\/hr, dynamically flow matched within 1% for consistent performance across all eight injectors.\"}},{\"@type\":\"Question\",\"name\":\"What connector style do these injectors use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"They use a PICO\/EV6-style USCAR connector with 14mm o-rings on both ends.\"}},{\"@type\":\"Question\",\"name\":\"Can these be used with any ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, these high-impedance injectors work with any ECU that uses high-impedance (saturated) fuel injector drivers, not just Holley EFI systems.\"}},{\"@type\":\"Question\",\"name\":\"Are these legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This part is legal for sale and use on Racing Use Only Vehicles only.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418580422704,"sku":"GVMR_522-108XFM","price":749.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-108x_8b3eaad8-554a-40b4-bc5c-52aa5ce27ce4.jpg?v=1758385049"},{"product_id":"dual-tank-fuel-pump-kit-534-38","title":"Holley Dual Tank Fuel Pump Kit, For MPI\/TBI\/Terminator EFI Systems up to 600 HP | 534-38","description":"\u003cp\u003eThis dual-tank fuel pump kit lets Holley MPI, TBI, and Terminator EFI systems run on vehicles equipped with dual fuel tanks. Because these fuel injection systems need a return line, fuel must be returned to the same tank it was drawn from. The kit was originally engineered for 4-barrel Pro-Jection and 950 MPFI\/4-barrel TBI systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: Dual Tank Fuel Pump Kit\u003c\/li\u003e\n\u003cli\u003eCompatible Systems: Holley MPI \/ TBI \/ Terminator EFI up to 600 HP\u003c\/li\u003e\n\u003cli\u003eIncludes: Switching valve, relay, switch, harness\u003c\/li\u003e\n\u003cli\u003eFitting Style: Barb\u003c\/li\u003e\n\u003cli\u003ePart Number: 534-38\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAlso required but not included: fuel hose, EFI pressure-rated hose clamps, 18-gauge wire, a 10-amp inline fuse, assorted terminals, and assembly lube. The selection valve switches tanks by reversing polarity on the \"D\" and \"E\" terminals — many dual-tank trucks already have this type of valve and hardware.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is this kit designed for?\u003c\/h5\u003e\u003cp\u003eIt lets Holley MPI, TBI, and Terminator EFI systems run on vehicles with dual fuel tanks, supporting up to 600 HP.\u003c\/p\u003e\u003ch5\u003eDoes this kit include fuel hose?\u003c\/h5\u003e\u003cp\u003eNo. You'll need to supply your own fuel hose, EFI-rated hose clamps, 18-gauge wire, a 10-amp inline fuse, and terminals in addition to the kit contents.\u003c\/p\u003e\u003ch5\u003eHow does tank switching work?\u003c\/h5\u003e\u003cp\u003eThe included selection valve switches between tanks by reversing the polarity of the \"D\" and \"E\" terminals.\u003c\/p\u003e\u003ch5\u003eWhat systems was this kit originally designed for?\u003c\/h5\u003e\u003cp\u003eIt was originally developed for 4-barrel Pro-Jection and 950 MPFI\/4-barrel TBI systems, and also works with other Holley MPI\/TBI\/Terminator EFI systems up to 600 HP.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is this kit designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It lets Holley MPI, TBI, and Terminator EFI systems run on vehicles with dual fuel tanks, supporting up to 600 HP.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include fuel hose?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. You'll need to supply your own fuel hose, EFI-rated hose clamps, 18-gauge wire, a 10-amp inline fuse, and terminals in addition to the kit contents.\"}},{\"@type\":\"Question\",\"name\":\"How does tank switching work?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The included selection valve switches between tanks by reversing the polarity of the D and E terminals.\"}},{\"@type\":\"Question\",\"name\":\"What systems was this kit originally designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It was originally developed for 4-barrel Pro-Jection and 950 MPFI\/4-barrel TBI systems, and also works with other Holley MPI\/TBI\/Terminator EFI systems up to 600 HP.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418580521008,"sku":"GVMR_534-38","price":584.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/534-38v2.jpg?v=1758385056"},{"product_id":"5-x-1-5-terminator-x-decal-36-476","title":"Holley Terminator X Decal, 5\" x 1.5\" | 36-476","description":"\u003cp\u003eThis Holley Terminator X decal is high quality and adheres easily to most surfaces, letting you show off your Terminator X system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSize: 5\" x 1.5\"\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eStyle: One-piece die cut, Holley Terminator X logo\u003c\/li\u003e\n\u003cli\u003ePart Number: 36-476\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat size is this decal?\u003c\/h5\u003e\u003cp\u003eIt measures 5\" x 1.5\".\u003c\/p\u003e\u003ch5\u003eWhat logo does it feature?\u003c\/h5\u003e\u003cp\u003eThe Holley Terminator X logo.\u003c\/p\u003e\u003ch5\u003eWhat surfaces can it be applied to?\u003c\/h5\u003e\u003cp\u003eIt adheres easily to most smooth surfaces.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What size is this decal?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It measures 5 inches by 1.5 inches.\"}},{\"@type\":\"Question\",\"name\":\"What logo does it feature?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Holley Terminator X logo.\"}},{\"@type\":\"Question\",\"name\":\"What surfaces can it be applied to?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It adheres easily to most smooth surfaces.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418582093872,"sku":"GVMR_36-476","price":5.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/36-476_01.jpg?v=1758385220"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-eight-522-128x","title":"Holley Terminator X Fuel Injectors, 120 lb\/hr, PICO\/EV6, Set of 8 | 522-128X","description":"\u003cp\u003eThese Terminator X high-impedance fuel injectors use a precision-lapped disc valve, high-quality brass windings, and high-temp O-rings for excellent linearity with no discernible bounce at low pulse widths. Sold as a set of eight PICO\/EV6-style injectors rated at 120 lb\/hr.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConnector: USCAR \/ EV6\u003c\/li\u003e\n\u003cli\u003eRated flow: 120 lb\/hr at 60 PSI base fuel pressure\u003c\/li\u003e\n\u003cli\u003eImpedance: High (12.2 Ohm)\u003c\/li\u003e\n\u003cli\u003eBody length: 1.85 in.; body diameter: 0.65 in.\u003c\/li\u003e\n\u003cli\u003eFuel type: E-85, gasoline\u003c\/li\u003e\n\u003cli\u003eO-ring to O-ring: 1.421 in.; 2 O-rings per injector\u003c\/li\u003e\n\u003cli\u003eSold as a set of eight\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-128X\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (commonly called \"LS3-style\"), with a USCAR connector and 14mm o-rings on both ends. When used in an intake manifold designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced to ensure proper fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat is the rated flow of these injectors?\u003c\/h5\u003e\u003cp\u003e120 lb\/hr at 60 PSI base fuel pressure.\u003c\/p\u003e\u003ch5\u003eHow many injectors come in this set?\u003c\/h5\u003e\u003cp\u003eEight — a full set for a V8 engine.\u003c\/p\u003e\u003ch5\u003eWhat connector style do they use?\u003c\/h5\u003e\u003cp\u003eA USCAR\/EV6 connector.\u003c\/p\u003e\u003ch5\u003eAre these legal for street use?\u003c\/h5\u003e\u003cp\u003eNo. These injectors are legal for sale and use on Racing Use Only Vehicles and cannot be installed on emissions-controlled street vehicles.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the rated flow of these injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"120 lb\/hr at 60 PSI base fuel pressure.\"}},{\"@type\":\"Question\",\"name\":\"How many injectors come in this set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Eight — a full set for a V8 engine.\"}},{\"@type\":\"Question\",\"name\":\"What connector style do they use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A USCAR\/EV6 connector.\"}},{\"@type\":\"Question\",\"name\":\"Are these legal for street use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. These injectors are legal for sale and use on Racing Use Only Vehicles and cannot be installed on emissions-controlled street vehicles.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418583175216,"sku":"GVMR_522-128X","price":623.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/522-128x.jpg?v=1758385311"},{"product_id":"holley-terminator-x-fuel-injectors-set-of-eight-522-308","title":"Holley Terminator X Fuel Injectors, 30 lb\/hr, Bosch\/EV1, Set of 8 | 522-308","description":"\u003cp\u003eThese Holley EFI fuel injectors use a precision-lapped disc valve, high-quality brass windings, and high-temp O-rings for excellent linearity with no discernible bounce at low pulse widths. Sold as a set of eight Bosch\/EV1-style injectors rated at 30 lb\/hr.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConnector: Bosch\/EV1-style (Jetronic)\u003c\/li\u003e\n\u003cli\u003eRated flow: 30 lb\/hr at 43 PSI\u003c\/li\u003e\n\u003cli\u003eImpedance: High\u003c\/li\u003e\n\u003cli\u003eBody length: 2.85 in.; body diameter: 0.97 in.\u003c\/li\u003e\n\u003cli\u003eFuel type: E-85, gasoline\u003c\/li\u003e\n\u003cli\u003eO-ring to O-ring: 2.415 in.; 2 O-rings per injector\u003c\/li\u003e\n\u003cli\u003eSupports up to 480 hp\u003c\/li\u003e\n\u003cli\u003eTri-cone spray pattern\u003c\/li\u003e\n\u003cli\u003eSold as a set of eight\u003c\/li\u003e\n\u003cli\u003ePart Number: 522-308\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for setups with a 38mm distance between o-ring seats on the fuel rail and intake manifold (commonly called \"LS3-style\"), with a USCAR connector and 14mm o-rings on both ends. When used in an intake manifold designed for factory LS3\/LS7 injectors, the bottom o-ring needs to be replaced to ensure proper fitment.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat's the rated flow of these injectors?\u003c\/h5\u003e\u003cp\u003e30 lb\/hr at 43 PSI base fuel pressure.\u003c\/p\u003e\u003ch5\u003eHow much horsepower can they support?\u003c\/h5\u003e\u003cp\u003eUp to 480 horsepower.\u003c\/p\u003e\u003ch5\u003eWhat connector style do they use?\u003c\/h5\u003e\u003cp\u003eBosch\/EV1 (Jetronic) style.\u003c\/p\u003e\u003ch5\u003eHow many are in a set?\u003c\/h5\u003e\u003cp\u003eEight injectors, a complete set for a V8 application.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What's the rated flow of these injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"30 lb\/hr at 43 PSI base fuel pressure.\"}},{\"@type\":\"Question\",\"name\":\"How much horsepower can they support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 480 horsepower.\"}},{\"@type\":\"Question\",\"name\":\"What connector style do they use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bosch\/EV1 (Jetronic) style.\"}},{\"@type\":\"Question\",\"name\":\"How many are in a set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Eight injectors, a complete set for a V8 application.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418583273520,"sku":"GVMR_522-308","price":699.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/injectorset_abfcf31e-c1da-40f2-872f-35f28809e832.jpg?v=1758385318"}],"url":"https:\/\/berryperformancesales.com\/collections\/holley-terminator.oembed?page=6","provider":"Berry Performance Sales","version":"1.0","type":"link"}