Holley EFI

This kit contains plug-and-play harnesses to connect Holley 24x or 58x main harness to Holley waste-fire DIS coils. Not compatible with 556-112 coil near plug smart coils (see 558-312 for 556-112 smart coil applications )FeaturesBolt on 2x4 4150 Flange...

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...

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...

The Holley Dominator ECU has built in capability to control dual Drive-By-Wire Chrysler Throttle Bodies - OEM P/N 53034251AB Additionally, this harness requires pedal assembly part number 0486 1714.Features7.25” diameter, 1/4” thick, billet steel,...

Dominator EFI GM DBW Harness-Early Truck. Compatible with GM part number 10379038.FeaturesAdd Even More Power to the Gen III Hemi Engine with a Holley Hi-Ram Intake ManifoldFits Gen III Hemi Engines w/ Large Intake Ports (1.70” Height x 1.88” Wide)...

Are you tired of scouring the junkyard for stock ls coil sub harnesses? Introducing the new Holley EFI LS Coil Sub Harness. This coil sub harness is intended to be used with factory LS coils and various Holley EFI main harnesses with Coil-on-plug...

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.FeaturesBosch/EV1 style performance injectors -...

Introducing J1A through J4 Connectors Kits so you no longer have to buy a complete connector kit if you only need one I/O connector

Single Plane EFI LS Intake Manifold. Fits all GM LS Gen III engines equipped with LS3/L92 style rectangular port cylinder headsFeaturesSoftware

Ford V8 Injector Harness for Jetronic "Bosch" style Fuel Injectors (Evenly Spaced)FeaturesBolt on 4150 Flange Carburetor ReplacementSupports up to 650HP with Four 100lb/hr InjectorsTerminator X Max Stealth 4150 kits provide transmission control for...

Replacement 92/102mm GM LS Throttle Body GasketFeaturesPlug and play compatibility with all Terminator, HP, and Dominator ECU’s (w/ module P/N 554-130)No programming necessary; eliminates the need to install duplicate sending unitsCompatible with all...

FeaturesBuilt in Relay - Must be wired to a switched 12v source.Plug and play with 2009+ GM 4L60E Transmissions