HP EFI

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...

Designed to plug and play with MSD Pro-Billet distributors and Holley EFI main harnesses with an ignition connector, such as part number 558-104.Features:Allows for plug and play ignition timing control when utilizing an MSD Pro-Billet distributor...

Crank signal conditioning module for HP, Dominator, and Terminator X ECU's. Requires Holley EFI V6 Build 300 or Terminator X V3 Build 100, or later.Specs: Brand: Holley EFI Category: Electrical, Lighting and Body Emission Code: 5 Harness Appli...

HEI Adapter HarnessSpecs: Brand: Holley EFI Category: Ignition Emission Code: 3 Harness Application: GM Harness Type: Ignition Part Type: Ignition Harness Product Type: Ignition Harnesses Sub Category: Ignition Wire and Related Components ...

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...

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...

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 for your GM LS engine comes complete with the main harness...

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...

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory injectors. The other harness is for the Bosch and Holley (or Jetronic/Minitimer) inject...

An Injector Harness is required and Holley offers two. The harness with USCAR/Stock injector connectors will cover most applications that are using the factory injectors. The other harness is for the Bosch and Holley (or Jetronic/Minitimer) inject...

Gen III HEMI Harness with TPS and Idle Air Control Connections.This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI engine with an aftermarket cable actuated throttle body. It is meant to be used in conjunction with an injector harnes...

Gen III HEMI Harness with TPS and Idle Air Control Connections. This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI engine with an aftermarket cable actuated throttle body. It is meant to be used in conjunction with an injector harne...

Chrysler has used two different coils on the HEMI engine series with 2006 being the year that the change was phased throughout the truck and car line. Fortunately the two coils are very different visually and makes for a simple review. If the coil...

Chrysler has used two different coils on the HEMI engine series with 2006 being the year that the change was phased throughout the truck and car line. Fortunately the two coils are very different visually and makes for a simple review. If the coil...

Ford V8 Injector Harness for Jetronic "Bosch" style Fuel Injectors (Evenly Spaced)Specs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Ford Harness Type: Injector Part Type: Fuel Injection Harness P...

Ford V8 Injector Harness for Ford USCAR / EV6 style Fuel Injectors (Evenly Spaced)Specs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Ford Harness Type: Injector Part Type: Fuel Injection Harness P...

Ford V8 Injector Harness for HP EFI & Dominator EFISpecs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 3 Harness Application: Ford Harness Type: Injector Part Type: Fuel Injection Harness Product Type: Ford EV1 Style...

Ford TFI Ignition Adapter HarnessSpecs: Brand: Holley EFI Category: Ignition Emission Code: 3 Harness Application: Ford Harness Type: Ignition Part Type: Ignition Harness Product Type: Ignition Harnesses Sub Category: Ignition Wire and Rel...

This wiring harness interfaces a Holley EFI ECU to a 2V Modular Ford engine. It is meant to be used in conjunction with an injector harness, a coil harness, and ignition modules. Most stock sensors are used with this harness.Features: 1999-2004 Fo...

Coil harness for 99-04 2 Valve Ford Modular (4.6 & 5.4L) Engines.Specs: Brand: Holley EFI Category: Ignition Emission Code: 4 Harness Application: Ford Harness Type: Ignition Part Type: Ignition Harness Product Type: Ford Modular Coil H...

Main harness for 99-04 2 & 4 Valve Ford Modular (4.6 & 5.4L) Engines.Specs: Brand: Holley EFI Category: Air and Fuel Delivery Emission Code: 4 Harness Application: Ford Harness Type: Main Part Type: Fuel Injection Harness Product Ty...

This fully terminated harness is compatible with HP and Dominator ECU's and is plug and play w/ the following products:554-118-HALL EFFECT CRANK TRIGGER SENSOR554-124-FERROUS TARGET CRANK SENSOR554-125-FLYING MAGNET CAMSHAFT SENSOR554-127-CAMSHAFT...