Holley EFI 558-504 - Universal V8 MPFI EFI HARNESS KIT

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!

NOTICE: You will need to purchase an ECU and O2 Sensor to make this a complete kit.