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Holley 550-602

Holley HP EFI ECU & Harness Kit GM LS1/LS6


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Holley HP EFI ECU & Harness Kit GM LS1/LS6 $2,004.95
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HP EFI ECU & Harness Kit
  • GM LS1/LS6
  • Jetronic/Minitimer Injector Connectors
  • Bosch Oxygen Sensor
  • Uses Factory GM Coil Harnesses
  • Holley 550-602 Details

    ECU & Harness


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    Complete 1997-Up GM LS Engine Plug and Play Engine Controller Kit

    Looking for a plug and play kit for your GM LS engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more! Is your cam too wild for a MAF? Power adders? You name it, and Holley EFI can handle it. Kits are not designed to control VVT (Variable Valve Timing) or Drive-by-Wire. VVT should be locked. Dominator ECU is required for drive-by-wire applications. Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard inputs and various other uses. When selecting an ECU, users need to ensure their planned controls can be run with the 4 inputs and 4 outputs as certain combinations may use more inputs/outputs than are available. If more inputs/outputs are required, users should choose the Dominator VMS. ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance.


    • Designed specifically for 1997-Present GM Gen III and Gen IV LS Style Engines (LS1/LS2/LS3/LS6/LS7)
    • Kits for 24x or 58x Crank Sensor
    • Plug and play with factory sensors; Crank, Cam, Cylinder Head Temp, etc
    • Plug and play with factory actuators; Coils, Injectors
    • Connectors for Holley Fuel Pressure and Oil Pressure sensors
    • Connectors for expanded Inputs and Outputs
    • Complete plug and play kits include HP ECU, Wideband O2 sensor (choice of Bosch or NTK), MAP sensor, Coil Drivers and all necessary Harnesses
    Click here for Holley HP Inline Fuel Pumps
    Click here for Holley Dominator Inline Fuel Pumps

    Does this come with the 5.7” display?

    Asked by: Munoz21
    No, this kit does not include the Display controller.
    Answered by: Rusty B
    Date published: 2018-07-31
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    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.