Special Offers

HP Smart Coil ignition sub-harness. Includes a pair of coil harnesses for an 8 cylinder engine. These harnesses are similar in design to factory GM LSx coil harnesses, but plug into Holley HP Smart Coils. They plug into Holley LSx plug and play main harnesses if one wants to replace factory LSx coils with Holley HP Smart Coils. If using a non-LSx main harness, purchase PN 558-307 for connectors, w..

The Holley EFI Ignition Adapter Harness for FAST™ Dual Sync Distributors allows easy connectivity of the Holley EFI wiring harness to the FAST™ Dual Sync Distributors.Features:Allows customer to run a "timed sequential" fuel strategyBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeDual Sync DistributorPart Number558-313..

Coil harness for 99-04 2 Valve Ford Modular (4.6 & 5.4L) Engines. BrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-314..

Coil harness for 99-04 4 Valve Ford Modular (4.6 & 5.4L) Engines. BrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-315..

Coil Harness for 2011 to 2015 Ford Coyote (5.0L) EnginesBrandHolley EFIEmission Code4Harness ApplicationFordHarness TypeIgnitionProduct TypeFord Modular Coil HarnessPart Number558-317..

"Big Wire" Sub Harness- pre wired with 12ga power and grounds, for optimal performance! Features:“Big Wire” Sub Harness- Pre wired with 12ga Power and Grounds, for optimal performance!BrandHolley EFIEmission Code4Harness TypeIgnitionProduct TypeIgnition HarnessesPart Number558-318..

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 with Dominator or HP ECU ..

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. BrandHolley EFIEmission Code4Harness Application..

BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ1 Auxillary Input/ Output Harness - ConnectorPart Number558-400..

Used when adding a second wide band oxygen sensor to a Dominator EFI installation. Features:J2A Connector#2 Wide band oxygen sensor harness (Fully Terminated)23 user programmable input wires with pre-crimped ECU pinsBrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ2 Auxiliary Input/ Output Harness - ConnectorPart Number558-401..

BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ2 Auxiliary Input/ Output Harness - ConnectorPart Number558-402..

BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ3 Auxiliary Input/ Output Harness - ConnectorPart Number558-403..

BrandHolley EFIEmission Code3Harness TypeAuxiliaryProduct TypeJ4 Auxiliary Input/ Output Harness - ConnectorPart Number558-4043This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles.The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:1965 and older U.S. manufactured California Certified vehicles1967 an..

Dominator EFI Multi Map SelectorBrandHolley EFIEmission Code5Harness TypeAuxiliaryProduct TypeMulti Map SelectorPart Number558-407..

j2A, j2B, j3, j4 Connector & Pin Kit - Contains connectors & pins, but no wiring. for Dominator EFIBrandHolley EFIEmission Code5Harness TypeAuxiliaryProduct TypeEFI Connector KitPart Number558-408..

7' long sealed USB data cable. This cable is included with the purchase of an HP or Dominator ECU.BrandHolley EFIEmission Code5Harness TypeAuxiliaryLength7'Product TypeUSB Data - Communication CablePart Number558-409..

Crank/Cam Ign. Harness. Fully terminated harness. Connects to Holley 60-2 crank sensor and GM Cam-Sync Distributor AC Delco PN213-350 or eficonnection.com sync pulse distributorBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeIgnitionProduct TypeCrank - Cam HarnessPart Number558-410..

Replacement main wiring harness for Terminator EFI kits 550-405 and 550-406.BrandHolley EFIEmission Code3Product TypeTerminator TBI Main Engine HarnessPart Number558-414..

Replacement throttle body wiring harness for Terminator EFI kits 550-405 and 550-406.BrandHolley EFIEmission Code3Product TypeTerminator Throttle Body HarnessPart Number558-415..

PN 558-420 contains 5 extra input/output wires that the base Terminator EFI harness does not contain. It contains Input wires for Inputs 1-4. It contains one wire for Output 2. These inputs and outputs can perform features and functions that must be programmed via Holley EFI laptop software. The software also contains instructions on how to program these.BrandHolley EFIEmission Code5Harness TypeAu..