{"product_id":"holley-terminator-x-ls-efi-system-gen-iv-4-8l-5-3l-6-0l-truck-ls2-ls3","title":"Holley Terminator X LS EFI System – Gen IV 4.8L\/5.3L\/6.0L Truck \u0026 LS2\/LS3","description":"\u003cp\u003eThe \u003cstrong\u003eHolley EFI Terminator X LS EFI System\u003c\/strong\u003e delivers complete standalone engine management for Gen IV GM LS truck engines, LS2, and LS3 applications equipped with a 58x crank reluctor, 4x cam sensor, and EV6 (USCAR) fuel injectors. Designed for builders who want OEM-like drivability with race-proven performance, Terminator X combines self-learning fuel control, advanced ignition management, boost control, nitrous control, and laptop tuning into one affordable package.\u003c\/p\u003e\n\u003cp\u003eWhether you're completing an LS swap, building a rock crawler, Ultra4 car, prerunner, muscle car, hot rod, drift car, or street truck, Terminator X comes loaded with proven base calibrations to get your engine running quickly. The integrated Bosch LSU 4.9 wideband oxygen sensor continuously refines the fuel map while Holley's free tuning software provides complete control for advanced users. Choose between a kit with the popular 3.5\" touchscreen handheld or the ECU-only version that uses a laptop for setup and tuning.\u003c\/p\u003e\n\u003ch4\u003eIncludes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eTerminator X ECU\u003c\/li\u003e\n\u003cli\u003e58x\/4x LS Main Wiring Harness\u003c\/li\u003e\n\u003cli\u003eEV6 (USCAR) Injector Harness\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 Wideband Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003eECU Main Power Harness\u003c\/li\u003e\n\u003cli\u003eInput\/Output Harness\u003c\/li\u003e\n\u003cli\u003eCAN to USB Tuning Cable\u003c\/li\u003e\n\u003cli\u003eVacuum Hose Adapters\u003c\/li\u003e\n\u003cli\u003eVariant 550-905 Includes 3.5\" Touchscreen Handheld\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAvailable Options:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e550-905\u003c\/strong\u003e – Includes 3.5\" Touchscreen Handheld\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e550-905T\u003c\/strong\u003e – ECU Kit Only (Laptop Setup Required)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewbox=\"0 0 14 14\" width=\"14\" height=\"14\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Compatibility\u003c\/td\u003e\n\u003ctd\u003eGen IV GM LS Truck, LS2, LS3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrank Trigger\u003c\/td\u003e\n\u003ctd\u003e58x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCam Trigger\u003c\/td\u003e\n\u003ctd\u003e4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInjector Style\u003c\/td\u003e\n\u003ctd\u003eEV6 (USCAR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Control\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive-By-Wire Support\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMAP Sensor\u003c\/td\u003e\n\u003ctd\u003eIntegrated 1-Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWideband Sensor\u003c\/td\u003e\n\u003ctd\u003eBosch LSU 4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInjector Drivers\u003c\/td\u003e\n\u003ctd\u003eHigh Impedance Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf Learning\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoost Control\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNitrous Control\u003c\/td\u003e\n\u003ctd\u003eSingle Stage Wet or Dry with Progressive Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e4 Programmable Inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e4 Programmable Outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Logging\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN Bus\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLaptop Tuning\u003c\/td\u003e\n\u003ctd\u003eIncluded via CAN\/USB Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel Type Support\u003c\/td\u003e\n\u003ctd\u003eGasoline and E85\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKnock Retard\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndividual Cylinder Fuel Correction\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewbox=\"0 0 14 14\" width=\"14\" height=\"14\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible With:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGen IV GM 4.8L Truck Engines (58x)\u003c\/li\u003e\n\u003cli\u003eGen IV GM 5.3L Truck Engines (58x)\u003c\/li\u003e\n\u003cli\u003eGen IV GM 6.0L Truck Engines (58x)\u003c\/li\u003e\n\u003cli\u003eGM LS2 Engines\u003c\/li\u003e\n\u003cli\u003eGM LS3 Engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eRequirements:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e58x Crank Reluctor\u003c\/li\u003e\n\u003cli\u003e4x Cam Sensor\u003c\/li\u003e\n\u003cli\u003eEV6 (USCAR) Fuel Injectors\u003c\/li\u003e\n\u003cli\u003eHigh-Impedance Fuel Injectors Only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Applications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLS Engine Swaps\u003c\/li\u003e\n\u003cli\u003eRock Crawlers\u003c\/li\u003e\n\u003cli\u003eUltra4 Race Cars\u003c\/li\u003e\n\u003cli\u003ePrerunners\u003c\/li\u003e\n\u003cli\u003eHot Rods\u003c\/li\u003e\n\u003cli\u003eMuscle Cars\u003c\/li\u003e\n\u003cli\u003eStreet Trucks\u003c\/li\u003e\n\u003cli\u003eCustom Off-Road Builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewbox=\"0 0 14 14\" width=\"14\" height=\"14\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ch3\u003eWhat engines does this kit fit?\u003c\/h3\u003e\n\u003cp\u003eThis kit is specifically designed for Gen IV GM LS truck engines, LS2, and LS3 engines using a 58x crank reluctor wheel, a 4x cam sensor, and EV6 (USCAR) fuel injectors.\u003c\/p\u003e\n\u003ch3\u003eWhat is the difference between the two part numbers?\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e550-905\u003c\/strong\u003e includes Holley's 3.5-inch touchscreen handheld for engine setup, tuning, and monitoring. \u003cstrong\u003e550-905T\u003c\/strong\u003e omits the handheld and uses the included CAN\/USB cable with Holley's free Terminator X software for setup and tuning.\u003c\/p\u003e\n\u003ch3\u003eCan Terminator X tune itself?\u003c\/h3\u003e\n\u003cp\u003eYes. Terminator X continuously learns and refines the fuel table using feedback from the Bosch LSU 4.9 wideband oxygen sensor, making startup and drivability improvements automatic while still allowing complete manual tuning when desired.\u003c\/p\u003e\n\u003ch3\u003eCan I run boost or nitrous?\u003c\/h3\u003e\n\u003cp\u003eYes. Terminator X includes integrated boost control, progressive wet or dry nitrous control, programmable safety strategies, and advanced tables for boost versus RPM, gear, speed, or time.\u003c\/p\u003e\n\u003ch3\u003eCan I expand the system later?\u003c\/h3\u003e\n\u003cp\u003eYes. Terminator X supports numerous Holley CAN accessories including digital dashes, shift lights, gauges, and additional modules, allowing the system to grow as your project evolves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"Holley","offers":[{"title":"Yes- Includes 3.5\" Touchscreen Handheld","offer_id":56905020080294,"sku":"550-905","price":1599.95,"currency_code":"USD","in_stock":true},{"title":"No- ECU Kit Only (Laptop Setup Required)","offer_id":56905020113062,"sku":"550-905T","price":1449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/550-905T-Holley-EFI-Terminator-X-1.jpg?v=1785864798","url":"https:\/\/wideopendesign.com\/products\/holley-terminator-x-ls-efi-system-gen-iv-4-8l-5-3l-6-0l-truck-ls2-ls3","provider":"Wide Open Design","version":"1.0","type":"link"}