{"product_id":"holley-terminator-x-gm-gen-iii-truck-550-904t","title":"Holley Terminator X, GM Gen III 4.8\/5.3\/6.0 Truck, DBC, Multec 2 | 550-904T","description":"\u003cp\u003eTerminator X gives Gen III GM truck engines a self-learning standalone EFI system without the cost or complexity of a hacked junkyard ECU. It features real-time fuel learn, high-impedance injector drivers, an integrated 1bar MAP sensor, and four programmable inputs and outputs for accessories like electric fans, boost control, or progressive nitrous. This kit ships with a USB\/CAN tuning cable instead of the handheld LCD, so setup and tuning happen through Holley's free Terminator X laptop software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuilt for GM LS\/truck engines with a 24x crank reluctor and Multec 2 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from base fuel table tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors (not compatible with low-impedance injectors)\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR readings and precise tuning\u003c\/li\u003e\n\u003cli\u003eIntegrated 1bar MAP sensor with vacuum hose adapters (1\/8\", 1\/4\", 3\/16\")\u003c\/li\u003e\n\u003cli\u003e4 outputs (Ground, PWM) for fans, boost control, nitrous control, IAC kits, and more\u003c\/li\u003e\n\u003cli\u003e4 inputs (12v, Ground, 5v, Frequency) for extra pressure sensors or activation triggers\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: Boost vs Time, Gear, RPM, 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\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced custom tables (4x 1D, 1x 1D per-gear, 4x 2D, 1x 2D per-gear) for flex fuel offset or custom safety tables\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\u003eCompact ECU size mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control of the system\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine\/Platform: Gen III GM Truck 4.8L\/5.3L\/6.0L\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eCam Signal: 1x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Multec 2\u003c\/li\u003e\n\u003cli\u003eThrottle Body Control: DBC (mechanical throttle body; Drive-By-Wire: No)\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: Integrated 1bar\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No — USB\/CAN tuning cable included instead\u003c\/li\u003e\n\u003cli\u003eWhat's Included: 24x LS engine main harness, Multec 2 injector harness, Terminator X ECU, ECU main power harness, Bosch LSU 4.9 wideband oxygen sensor, input\/output harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-904T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs must be mounted with the diagnostic LEDs facing up. Because this kit uses the USB\/CAN cable rather than the handheld, initial setup requires the free Terminator X laptop software.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the 550-904T Terminator X system support?\u003c\/h5\u003e\u003cp\u003eGen III GM truck engines — 4.8L, 5.3L, and 6.0L — with a 24x crank reluctor, 1x cam signal, and Multec 2 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include the handheld tuner?\u003c\/h5\u003e\u003cp\u003eNo, this version includes a USB\/CAN tuning cable instead of the 3.5\" handheld, and requires the free Terminator X laptop software for setup.\u003c\/p\u003e\u003ch5\u003eIs this a drive-by-wire system?\u003c\/h5\u003e\u003cp\u003eNo, this kit is set up for a mechanical (DBC) throttle body, not drive-by-wire.\u003c\/p\u003e\u003ch5\u003eDoes it control an automatic transmission?\u003c\/h5\u003e\u003cp\u003eNo, this kit does not include transmission control.\u003c\/p\u003e\u003ch5\u003eWhat injectors does it support?\u003c\/h5\u003e\u003cp\u003eMultec 2 connector, high-impedance injectors — most stock LS and Holley EFI injectors work, but it will not control low-impedance injectors.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the 550-904T Terminator X system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Gen III GM truck engines — 4.8L, 5.3L, and 6.0L — with a 24x crank reluctor, 1x cam signal, and Multec 2 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include the handheld tuner?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this version includes a USB\/CAN tuning cable instead of the 3.5\\\" handheld, and requires the free Terminator X laptop software for setup.\"}},{\"@type\":\"Question\",\"name\":\"Is this a drive-by-wire system?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit is set up for a mechanical (DBC) throttle body, not drive-by-wire.\"}},{\"@type\":\"Question\",\"name\":\"Does it control an automatic transmission?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, this kit does not include transmission control.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Multec 2 connector, high-impedance injectors — most stock LS and Holley EFI injectors work, but it will not control low-impedance injectors.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42527093522480,"sku":"GVMR_550-904T","price":1349.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-w-tuner-cable19277_b9cd3022-91b3-4366-b7e7-2d7c75830546.jpg?v=1761900513","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-gm-gen-iii-truck-550-904t","provider":"Berry Performance Sales","version":"1.0","type":"link"}