Holley 550-604 Holley HP EFI ECU and Harness Kits

Free Shipping - Holley HP EFI ECU and Harness Kits with qualifying orders of $109. Shop Engine Management Systems at Summit Racing.
Engine Management Systems, HP EFI, ECU and Harness, Up to 16-Injectors, 8-Coils, Four Digital Inputs, Wideband, CANBUS, Universal, MPFI, Kit

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Looking for a plug and play alternative for your stock or built late model factory EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU.

Holley 550-604N - HP EFI ECU and Harness Kit

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Holley EFI 550-604N HP EFI ECU & Harness Kits

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An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important as the power side. Our Holley EFI Harness Kit comes complete with the main harness, power harness and injector harness to support your primary system!.