Performance Parts

Holley EFI Wiring Shop just keeps getting better! We have one goal, to provide you a one stop solution for all of your wiring components needs. From connectors and pins to wire loom and tools! We have everything you need to build or service your H...

These two new MAP sensor adapters from Holley EFI allow you to quickly add a stainless steel MAP sensor to your existing installation. Holley part #558-466 adapts harnesses with a (MPFI) Weatherpack 3-pin connector to the 3-pin Delphi GT connector...

Take your forced induction ride to the next level with a Holley water/meth injection system! Integrated into the Holley HP and Dominator EFI Systems is the capability to control water/methanol injection, allowing you to safely run on lower octane ...

Take your forced induction ride to the next level with a Holley water/meth injection system! Integrated into the Holley HP and Dominator EFI Systems is the capability to control water/methanol injection, allowing you to safely run on lower octane ...

V8 over Manifold, Bosch Style Connector Harness for Avenger EFI, HP EFI & Dominator EFISpecs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Universal Harness Type: Injector Product Type: Bosch EV...

Unterminated Universal Main Harness for HP EFI & Dominator EFIFeatures:Unterminated for custom routing and wire lengthsSpecs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Universal Harness Type: ...

Unterminated 16 injectors MPFI harness Terminated at injector connectors (Bosch style). Harness must be assembled and require crimping Metripak150 connectors. Includes all connectors, pins, terminals, and loom needed. for HP EFI & Dominator EF...

The unterminated main harness comes with both J1A and J1B connectors full terminated with 15' of flying lead wiring.Features: Unterminated 15’ long flying lead harness 60 Holley Crimped Wires (57x 20 ga, 3x 18 ga) 30 optional plug seals Specs: Br...

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 in...

Universal Unterminated Injector Harness for HP EFI & Dominator EFI(Bosch EV1 style).Specs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Universal Harness Type: Injector Part Type: Fuel Injection...

Universal Unterminated Ignition Harness for HP EFI & Dominator EFISpecs: Brand: Holley EFI Category: Ignition Emission Code: 3 Harness Application: Universal Harness Type: Ignition Part Type: Ignition Harness Product Type: Universal Unt...

Universal MPFI Main Harness for HP EFI & Dominator EFISpecs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Ford, GM, Universal Harness Type: Main Part Type: Fuel Injection Harness Product Type: ...

This harness provides a plug and play upgrade solution for those seeking to convert to Coil-On-Plug. Additionally we have pre-installed a Power Tap for easy access to 12v, 5v Reference, and Sensor Grounds.Features: Built in C-O-P Harness Additiona...

Introducing the Holley EFI Wiring Shop. We have one goal, to provide you a one stop solution for all of your wiring components needs. From connectors and pins to wire loom and tools! We have everything you need to build or service your Holley EFI ...

Universal Ford V8 Harness Kit for Holley HP and Dominator ECU'sFeatures: Harness Kit Includes: Main Power Harness, Universal MPFI Main Harness, Ford V-8 Injector Harness, Ignition Adapter & Tach Input Simple Installation Can be used with HP or...

Universal Coil On/Near Plug Harness – Use to connect Holley PN 558-312 or factory GM LSx coil harnesses to Holley HP or Dominator ECU'sFeatures: For use with Holley HP or Dominator ECUs Universal Connects 558-312 or factory GM LSx coil harnesses S...

Specifically designed for use in unlimited racing applications equipped with an external, dry timing-belt, cam drive system, where the bracket must be remote mounted to a front motor plate or some mounting surface other than a designated cam cover...

Universal 6 Cylinder Injector Harness for HP EFI & Dominator EFIFeatures:Terminated and ready for plug and play injector connectionsSpecs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Universal H...

This Universal 4 Cylinder EV14 Injector Harness is designed to be plug and play with HP EFI & Dominator EFI Systems, utilizing our 205 LB/HR Injector Set - Part Number 522-205.Specs: Brand: Holley EFI Category: Air and Fuel Delivery Emissio...

Finally, an affordable Coyote intake manifold that also performs! The Hi-Ram and Ultra Lo-Ram are designed to fit stock bolt pattern OE heads found on the 2011-2023 Ford 5.0 Coyotes and related engine families, such as, Voodoo and Predators. These...

This in-tank fuel pump module is a high-pressure unit that flows 350 liters per hour (LPH) and is capable of supporting electronic fuel injection (EFI) engines producing up to 750 horsepower. Featuring a pre-calibrated fuel-level sending unit desi...

This in-tank fuel pump module is a high-pressure unit that flows 350 liters per hour (LPH) and is capable of supporting electronic fuel injection (EFI) engines producing up to 750 horsepower. Featuring a pre-calibrated fuel-level sending unit desi...

This in-tank fuel pump module is a high-pressure unit that flows 350 liters per hour (LPH) and is capable of supporting EFI (electronic fuel injection) engines producing up to 750 horsepower. Fuel pressure is internally regulated to 58 psi elimina...

This in-tank fuel pump module is a high-pressure unit that flows 350 liters per hour (LPH) and is capable of supporting electronic fuel injection (EFI) engines producing up to 750 horsepower. Featuring a pre-calibrated fuel-level sending unit desi...