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    Holley EFI Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3 550-935T

    Vendor: Holley EFI
    Part Number: 550-935T
    Save $269
    Sale Price $2,149.95 Regular Price $2,418.95

    Currently out of stock.

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    Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won't break the bank!


    Holley EFI Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3 550-935T


    Specifications:

    10429 Yes
    10431 Yes
    Brand Holley EFI
    10423 Yes
    Category Air and Fuel Delivery
    10438 Yes
    Crank Reluctor 58x
    10430 Yes
    10437 No
    Drive-By-Wire Yes
    10442 Yes
    10418 Yes
    10428 Yes
    Emission Code 3
    Engine Gen IV GM LS
    10433 Yes
    7246 No
    10417 No
    906 No
    10425 No
    8922 No
    3390 Performance
    Handheld Included No
    909 No
    10422 Yes
    Ignition Type GM LS 58x
    10432 Yes
    Injector Connector Jetronic/Minitimer (Bosch EV1)
    9780 No
    10427 Yes
    MAP Sensor 1bar
    30 No
    10420 Yes
    part type Fuel Injection System
    Product Type EFI System
    10421 Yes
    10434 Yes
    Sub Category Fuel Injection System and Related Components
    Terminator LS Options Fuel, Spark, Drive-by-Wire, Transmission
    918 No
    Transmission 4L60E/4L80E
    10435 Yes
    Warning California Proposition 65
    10419 Yes
    10429 Yes
    10431 Yes
    Brand Holley EFI
    10423 Yes
    Category Air and Fuel Delivery
    10438 Yes
    Crank Reluctor 58x
    10430 Yes
    10437 No
    Drive-By-Wire Yes
    10442 Yes
    10418 Yes
    10428 Yes
    Emission Code 3
    Engine Gen IV GM LS
    10433 Yes
    7246 No
    10417 No
    906 No
    10425 No
    8922 No
    3390 Performance
    Handheld Included No
    909 No
    10422 Yes
    Ignition Type GM LS 58x
    10432 Yes
    Injector Connector Jetronic/Minitimer (Bosch EV1)
    9780 No
    10427 Yes
    MAP Sensor 1bar
    30 No
    10420 Yes
    part type Fuel Injection System
    Product Type EFI System
    10421 Yes
    10434 Yes
    Sub Category Fuel Injection System and Related Components
    Terminator LS Options Fuel, Spark, Drive-by-Wire, Transmission
    918 No
    Transmission 4L60E/4L80E
    10435 Yes
    Warning California Proposition 65
    10419 Yes
    Description_INV TERMINATOR X MAX MPFI W/TRANS & DBW
    Description_ASC Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or before due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management.
    Description_DES Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
    Description_EXT 58x Crank - 4x Cam - EV1 Injectors - Drive-By-Wire Throttle Body and Transmission Control - USB/CAN Tuning Cable
    Description_MKT Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price!
    Description_MKT Terminator X Max features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Part number 550-928 also has 4L60E or 4L80E Transmission control and Drive-By Wire Throttle Body control. Terminator X Max comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast. These Terminator X kits include a USB/CAN tuning cable instead of the 3.5" Handheld LCD, these kits require the use of the free Terminator X Software for initial setup. The Terminator X Software includes multiple base calibrations to choose from for either naturally aspirated or boosted engines.
    Description_MKT Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won't break the bank!
    Description_FAB Designed for GM LS 4.8/5.3/6.0 LS truck engines and LS2/LS3 with 58x Crank, 4x Cam and 4L60E/4L80E transmissions, Drive-by-wire throttle body control, and EV1 injectors
    Description_FAB Real-Time fuel map learning
    Description_FAB High impedance injector drivers will safely power most OEM LS injectors and Holley EFI injectors, provided is the injector support chart (Will not control low impedance injectors)
    Description_FAB Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control
    Description_FAB Onboard 1 Bar MAP sensor is perfect for N/A or nitrous engine combinations (If your combination requires a 2+ Bar, we recommend GM part number 12592525 and Holley part number 558-416)
    Description_FAB MAP sensor vacuum hose adapters are 1/8th, ¼, and 3/16th
    Description_FAB 4 Inputs are 12V, Ground, 5V, and frequency, for things such as additional pressure sensors, activation triggers for nitrous activation or a transmission brake
    Description_FAB 4 Outputs are Ground and PWM- for accessories like fans, boost control, nitrous control, IAC Kit, and more
    Description_FAB Boost Control has Boost vs. Time, Boost vs. Gear, Boost vs. RPM, Boost vs. Speed, Boost Safeties
    Description_FAB Nitrous Control has Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
    Description_FAB Advanced Tables include 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table that can be used for any custom tables for Flex Fuel Sensor Offset Table or a custom fuel or oil pressure safety
    Description_FAB Diagnosis immediately with onboard LED’s for ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, and Cam Signal
    Description_FAB Included CAN/USB tuning cable allowing you to configure your ECU and tuning the engine in real time
    Description_FAB Compact ECU size allows you to mount it virtually anywhere (Mount with LED’s facing up for quick diagnosis)
    Description_FAB Plug and play compatible with multiple Holley EFI accessories including our gauges, shift lights, various modules, and digital and pro dashes (Holley P/N's 553-106, 553-111, and 553-112)
    Description_FAB Free EFI tuning software for complete control of your Terminator X system
    Description_FAB Recommended GM pedal P/N 10379038
    Description_FAB Included are 58x/4x LS Engine Main Harness, EV1 Injector Harness, Drive-By-Wire Throttle Body Harness, 4L60E/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband Oxygen Sensor, I/O Harness
    Description_INV TERMINATOR X MAX MPFI W/TRANS & DBW
    Description_ASC Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or before due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management.
    Description_DES Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
    Description_EXT 58x Crank - 4x Cam - EV1 Injectors - Drive-By-Wire Throttle Body and Transmission Control - USB/CAN Tuning Cable
    Description_MKT Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price!
    Description_MKT Terminator X Max features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Part number 550-928 also has 4L60E or 4L80E Transmission control and Drive-By Wire Throttle Body control. Terminator X Max comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast. These Terminator X kits include a USB/CAN tuning cable instead of the 3.5" Handheld LCD, these kits require the use of the free Terminator X Software for initial setup. The Terminator X Software includes multiple base calibrations to choose from for either naturally aspirated or boosted engines.
    Description_MKT Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won't break the bank!
    Description_FAB Designed for GM LS 4.8/5.3/6.0 LS truck engines and LS2/LS3 with 58x Crank, 4x Cam and 4L60E/4L80E transmissions, Drive-by-wire throttle body control, and EV1 injectors
    Description_FAB Real-Time fuel map learning
    Description_FAB High impedance injector drivers will safely power most OEM LS injectors and Holley EFI injectors, provided is the injector support chart (Will not control low impedance injectors)
    Description_FAB Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control
    Description_FAB Onboard 1 Bar MAP sensor is perfect for N/A or nitrous engine combinations (If your combination requires a 2+ Bar, we recommend GM part number 12592525 and Holley part number 558-416)
    Description_FAB MAP sensor vacuum hose adapters are 1/8th, ¼, and 3/16th
    Description_FAB 4 Inputs are 12V, Ground, 5V, and frequency, for things such as additional pressure sensors, activation triggers for nitrous activation or a transmission brake
    Description_FAB 4 Outputs are Ground and PWM- for accessories like fans, boost control, nitrous control, IAC Kit, and more
    Description_FAB Boost Control has Boost vs. Time, Boost vs. Gear, Boost vs. RPM, Boost vs. Speed, Boost Safeties
    Description_FAB Nitrous Control has Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
    Description_FAB Advanced Tables include 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table that can be used for any custom tables for Flex Fuel Sensor Offset Table or a custom fuel or oil pressure safety
    Description_FAB Diagnosis immediately with onboard LED’s for ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, and Cam Signal
    Description_FAB Included CAN/USB tuning cable allowing you to configure your ECU and tuning the engine in real time
    Description_FAB Compact ECU size allows you to mount it virtually anywhere (Mount with LED’s facing up for quick diagnosis)
    Description_FAB Plug and play compatible with multiple Holley EFI accessories including our gauges, shift lights, various modules, and digital and pro dashes (Holley P/N's 553-106, 553-111, and 553-112)
    Description_FAB Free EFI tuning software for complete control of your Terminator X system
    Description_FAB Recommended GM pedal P/N 10379038
    Description_FAB Included are 58x/4x LS Engine Main Harness, EV1 Injector Harness, Drive-By-Wire Throttle Body Harness, 4L60E/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband Oxygen Sensor, I/O Harness


    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
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    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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