{"product_id":"holley-terminator-x-max-stealth-4150-gm-ls-550-1012","title":"Holley Terminator X Max Stealth 4150, GM LS 24x\/58x, 4L60E\/4L80E | 550-1012","description":"\u003cp\u003eThe Terminator X Max Stealth 4150 is a bolt-on carburetor-replacement EFI system with (4) 100 lb\/hr fuel injectors supporting up to 650 HP naturally aspirated or 600 HP with forced induction. Its Stealth design routes all wiring below the rear fuel injector cover for a clean installation, and this configuration adds transmission control for pre-2009 GM 4L60E\/4L80E transmissions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e(4) 100 lb\/hr fuel injectors supporting up to 650 HP N\/A or 600 HP with forced induction\u003c\/li\u003e\n\u003cli\u003e3.5\" LCD handheld touchscreen for setup, tuning, and gauge displays\u003c\/li\u003e\n\u003cli\u003eInitial handheld calibration wizard creates a base tune with no laptop required\u003c\/li\u003e\n\u003cli\u003eAdvanced annular discharge rings for improved fuel flow and atomization\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband O2 sensor for real-time fuel map learning\u003c\/li\u003e\n\u003cli\u003eOEM-style TPS\/IAC design built for longevity\u003c\/li\u003e\n\u003cli\u003eInternal 1 Bar MAP sensor built into the ECU\u003c\/li\u003e\n\u003cli\u003eBolt-on 4150 flange carburetor replacement fits many factory intake manifolds\u003c\/li\u003e\n\u003cli\u003eAir entry machined to fit many stock-style air cleaners with locator provisions\u003c\/li\u003e\n\u003cli\u003eTransmission kick-down provisions for GM TH350\/400, 200R4\/700R4, and Ford C4\/C6\u003c\/li\u003e\n\u003cli\u003eTransmission control for pre-2009 GM 4L60E\/4L80E transmissions\u003c\/li\u003e\n\u003cli\u003eIntegrated ignition timing control improves idle stability, economy, and WOT power\u003c\/li\u003e\n\u003cli\u003eFour inputs (12V, ground, 5V, frequency) for pressure sensors, triggers, trans brake, etc.\u003c\/li\u003e\n\u003cli\u003eFour outputs (ground, PWM-) for fans, boost\/nitrous control, IAC, etc.\u003c\/li\u003e\n\u003cli\u003ePre-terminated fuel and oil pressure inputs\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine Platform: GM LS, 24x or 58x reluctor\u003c\/li\u003e\n\u003cli\u003eFlange Size\/Style: 4150, square-bore\u003c\/li\u003e\n\u003cli\u003eInjector Size: (4) 100 lb\/hr @ 58.5 PSI\u003c\/li\u003e\n\u003cli\u003eMax Horsepower Rating: 650 HP\u003c\/li\u003e\n\u003cli\u003eFuel Pressure: 58.5 PSI (requires external regulator, e.g. Holley P\/N 12-886)\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: Internal, 1 Bar\u003c\/li\u003e\n\u003cli\u003eTransmission Control: GM 4L60E\/4L80E (pre-2009)\u003c\/li\u003e\n\u003cli\u003eThrottle Bore: 1.75\"\u003c\/li\u003e\n\u003cli\u003eFinish: Black\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-1012\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 converter lockup\/downshift strategy changes. The ECU is not recommended for marine use but can be run off-road with proper mounting, weatherproofing, and wiring management. Refer to the owner's manual for full installation instructions.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat horsepower can the Terminator X Max Stealth 4150 support?\u003c\/h5\u003e\u003cp\u003eUp to 650 HP naturally aspirated or 600 HP with forced induction, using the included (4) 100 lb\/hr injectors.\u003c\/p\u003e\u003ch5\u003eDoes it include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it comes with a 3.5\" LCD handheld touchscreen and a calibration wizard that builds a base tune without a laptop.\u003c\/p\u003e\u003ch5\u003eWhat transmissions does the 550-1012 control?\u003c\/h5\u003e\u003cp\u003eIt's configured for pre-2009 GM 4L60E\/4L80E transmissions, with kick-down provisions also available for GM TH350\/400, 200R4\/700R4, and Ford C4\/C6.\u003c\/p\u003e\u003ch5\u003eIs this compatible with electronic 4x4 transfer cases?\u003c\/h5\u003e\u003cp\u003eNo, it's not recommended for 4x4 applications with electronic transfer cases.\u003c\/p\u003e\u003ch5\u003eDoes it require an external fuel pressure regulator?\u003c\/h5\u003e\u003cp\u003eYes, an external regulator set to 58.5 PSI base pressure is required (Holley P\/N 12-886 or equivalent).\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What horsepower can the Terminator X Max Stealth 4150 support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 650 HP naturally aspirated or 600 HP with forced induction, using the included (4) 100 lb\/hr injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does it include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it comes with a 3.5 inch LCD handheld touchscreen and a calibration wizard that builds a base tune without a laptop.\"}},{\"@type\":\"Question\",\"name\":\"What transmissions does the 550-1012 control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's configured for pre-2009 GM 4L60E\/4L80E transmissions, with kick-down provisions also available for GM TH350\/400, 200R4\/700R4, and Ford C4\/C6.\"}},{\"@type\":\"Question\",\"name\":\"Is this compatible with electronic 4x4 transfer cases?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's not recommended for 4x4 applications with electronic transfer cases.\"}},{\"@type\":\"Question\",\"name\":\"Does it require an external fuel pressure regulator?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, an external regulator set to 58.5 PSI base pressure is required (Holley P\/N 12-886 or equivalent).\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418585698352,"sku":"GVMR_550-1012","price":2349.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/550-1012_xmax-collage.jpg?v=1758385526","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-max-stealth-4150-gm-ls-550-1012","provider":"Berry Performance Sales","version":"1.0","type":"link"}