Holley 550-617 HP EFI ECU & Harness Kits
- This item ships directly from the manufacturer. It may take an additional 2 business days for Holley to ship this item.
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Looking for a plug and play kit for your Ford Modular 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.
- Designed specifically for 1999-2004 Ford Modular 4 Valve Engines
- Plug and play with factory sensors; Crank, Cam, TPS, Coolant Temp, etc
- Plug and play with factory actuators; Coils, Injectors, IAC
- Connectors for Holley Fuel Pressure and Oil Pressure sensors
- Connectors for expanded Inputs and Outputs
- Complete plug and play kit includes HP ECU, Bosch Wideband O2 sensor, MAP sensor, Coil Drivers and all necessary Harnesses
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Q & A
Unbox our most popular wiring harness with Tim.
Pat shows off how easy wiring your LS can be with our LS wiring kit.
Testing a 2 or 3 wire speed sensor sounds difficult, but these videos show that it actually is quite easy!