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!
GM 58X EFI HARNESS KITPart #: 558-501
- Length: 14"
- Width: 15"
- Height: 5"
- Emissions Code: 4
- Prop 65: No
NOTICE: You will need to purchase an ECU and O2 Sensor to make this a complete kit.
- Harness Kit Includes; Main Power Harness, LS2 Main Harness & LSX Injector harness
- Simple Installation
- Works with HP or Dominator ECU's