Service Parts

Introducing the latest sensors to the Holley EFI line up – Current Transducers. These high-quality transducers can be easily installed to monitor the amp draw from any mission-critical component, such as fuel pumps, alternators, electric water pumps, or even inductive ignition coils. Both of the Holley EFI Current Transducers are dual range, meaning they can monitor both high and low amp current d..

Introducing the latest sensors to the Holley EFI line up – Current Transducers. These high-quality transducers can be easily installed to monitor the amp draw from any mission-critical component, such as fuel pumps, alternators, electric water pumps, or even inductive ignition coils. Both of the Holley EFI Current Transducers are dual range, meaning they can monitor both high and low amp current d..

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 pump gas! What makes the Holley water/methanol system unique and light years ahead of competitive systems, is that the solenoid flow has been characteri..

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 pump gas! What makes the Holley water/methanol system unique and light years ahead of competitive systems, is that the solenoid flow has been characteri..

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 pump gas! What makes the Holley water/methanol system unique and light years ahead of competitive systems, is that the solenoid flow has been characteri..

GM Tuned Port / Holley Steathram Engine HarnessBrandHolley EFIEmission Code3Harness ApplicationTPI/ StealthramHarness TypeMainProduct TypeTPI - Stealthram Main Engine HarnessPart Number558-101..

Universal MPFI Main Harness for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationFordGMUniversalHarness TypeMainProduct TypeUniversal MPI Main Engine HarnessPart Number558-104..

BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeMainProduct TypeUniversal Unterminated Main Engine HarnessPart Number558-105..

Main Harness for 99-04 2 & 4 Valve Ford Modular (4.6 & 5.4L) Engines for use with Holley Smart CoilsBrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeMainProduct TypeFord Modular Main Engine HarnessPart Number558-113..

Introducing 2x4 Terminator Stealth EFI upgrade components. The wait is over. These upgrade components allow you to use your current Terminator Stealth EFI throttle body, install a new main harness, and slave throttle body, and you are finished. This upgrade is also perfect for anyone wanting to convert their 2x4 supercharged combo over to Electronic Fuel Injection!Features:2x4 Side Mount Stealth T..

Introducing Coyote Twin Independent Variable Cam Timing Control from Holley EFI! Do you have a coyote crate engine going in your dream car? Is your weekend road race warrior powered by a coyote junkyard engine with locked cams? Unlock the full potential of your high revving power plant with the Holley EFI Plug and Play Coyote Ti-VCT Control Module.Features:Plug and Play Coyote Main Engine HarnessC..

Introducing Coyote Twin Independent Variable Cam Timing Control from Holley EFI! Do you have a coyote crate engine going in your dream car? Is your weekend road race warrior powered by a coyote junkyard engine with locked cams? Unlock the full potential of your high revving power plant with the Holley EFI Plug and Play Coyote Ti-VCT Control Module.Features:Compatible with HP or Dominator EFITi-VCT..

Introducing Coyote Twin Independent Variable Cam Timing Control from Holley EFI! Do you have a coyote crate engine going in your dream car? Is your weekend road race warrior powered by a coyote junkyard engine with locked cams? Unlock the full potential of your high revving power plant with the Holley EFI Plug and Play Coyote Ti-VCT Control Module.Features:Compatible with HP or Dominator EFITi-VCT..

The unterminated main harness comes with both J1A and J1B connectors full terminated with 15' of flying lead wiring.Features:15’ long flying lead harness, allows you to completely customize your main harness installation60 Holley Crimped Wires (57x 20 ga, 3x 18 ga)30 optional plug sealsBrandHolley EFIEmission Code4Harness ApplicationUniversalHarness TypeMainProduct TypeUniversal Unterminated Main ..

V8 over Manifold, Bosch Style Connector Harness for Avenger EFI, HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeBosch EV1 Style Injector HarnessPart Number558-200..

BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeInjector Harness - ConnectorPart Number558-202..

BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeInjector Harness - ConnectorPart Number558-203..

Universal Unterminated Injector Harness for HP EFI & Dominator EFI(Bosch EV1 style).BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeUniversal Unterminated Injector HarnessPart Number558-204..

2x4 BBL Holley TBI Injector Harness for HP EFI & Dominator EFI BrandHolley EFIEmission Code3Harness ApplicationTBIHarness TypeInjectorProduct TypeThrottle Body Injector HarnessPart Number558-206..

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 EFI BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeUniversal Unterminated Injector HarnessPart Number558-207..