Special Offers

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..

3 Port Boost Control Solenoid Valve Includes: (1) solenoid, (1) ECU pigtail harness with factory crimped ECU pin, (3) 3/16" barb fittings, (1) 1/8" NPT plug, (1) Sintered brass muffler. and (1) spare ECU pin for modified harness lengths.BrandHolley EFIConnector Type2 pin Metri-Pack 150Depth.94"Emission Code5Height1.97"Pig Tail Length18"Port Size1/8" NPTProduct TypeBoost Control PartWidth1.10"Pa..

Introducing the newest development from the Holley EFI engineering team. The Holley EFI High Flow Dual Port Boost Control Kit. This kit contains a set of pre-installed high flow solenoids, which feature a dual O-ring sealing design, preventing any boost leaks out of the manifold. A black anodized billet aluminum manifold, with built in mounting provisions. Two pre-terminated connectors for a qui..

The Street Fire Spark Plug Wires feature a low resistance conductor that's wrapped in a sleek and durable black sleeve. The terminals are covered in black boots that protect the conductor from engine heat to ensure spark delivery.1 Cylinder16”2 Cylinder15”3 Cylinder21”4 Cylinder19”5 Cylinder24”6 Cylinder22”7 Cylinder35”8 Cylinder31”BrandStreet FireCoil Wire13”Emission Code5Part Number5576..

The Street Fire Spark Plug Wires feature a low resistance conductor that's wrapped in a sleek and durable black sleeve. The terminals are covered in black boots that protect the conductor from engine heat to ensure spark delivery.1 Cylinder29”2 Cylinder24”3 Cylinder24”4 Cylinder23”5 Cylinder24”6 Cylinder22”BrandStreet FireCoil Wire16”Emission Code5Part Number5577..

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.BrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeMainProduct TypeFord Modular Main Engine HarnessPart Number558-108..

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..

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..

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 HarnessAdditional 40 amp relay to power individual coils20awq gauge wire or larger!Plug and play with 558-312 or 558-318 Smart Coil Sub Harnesses.Dual CANbus Connectors fo..

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. The Ford MPFI C-O-P Main Harness has also been pre-terminated for the stock Pulse Width Modulated Idle Air Control motors commonly found on Fuel Injected Windsor 5.0L engines.Features:Built in C..

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 ..