Holley Performance

Holley EFI Systems Universal V8 Wiring Harness

  • VENDOR: Holley Performance

  • PART#: HOL-558-504

    YOUR PRICE: Regular price $541.95


Holley offers a variety of direct replacement EFI wiring harnesses, including multi-port, sequential, and throttle body injection styles. These units are made with premium components to ensure better reliability and performance for your ride--and they're compatible with many engine swaps. Holley EFI systems wiring harnesses are sold individually or as a kit; choose the model needed for your fuel injection application.


  • Kits Includes main power harness
  • Universal MPFI main harness
  • V8 injector harness
  • Works with Holley HP or Dominator ECUs.


Emission Code 4
Harness Application Ford, GM, UNIVERSAL
Ignition Type CD Ignition (No Timing Control)
Injector Connector Jetronic / Minitimer (Bosch)
Product Type Harness Kit
Part Number 558-504