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  • 558-405_0118305.jpg
    Holley EFI
    Fuel Injection Wire Harness
    $235.95
    $263.00
    $235.95
    GM 4L60/80E Transmission Harness - Complete terminated harness with j4 connector to operate GM electronic transmissions. for Dominator EFI
  • 558-404.jpg
    Holley EFI
    Dominator EFI Connector J4 Auxiliary Harness;
    $162.95
    $182.00
    $162.95
    J4 ECU Connector26 User Programmable Inputs and Outputs
  • 558-403.jpg
    Holley EFI
    Dominator EFI Connector J3 Auxiliary Harness;
    $130.95
    $146.00
    $130.95
    J3 ECU Connector17 User Programmable Inputs and Outputs
  • 558-402.jpg
    Holley EFI
    Dominator EFI Connector J2B Auxiliary Harness;
    $146.00
    $146.00
    $146.00
    J2B Connector Four Additional Injector Driver Outputs Four Additional Coil Driver Outputs23 User Programmable Outputs
  • 558-401.jpg
    Holley EFI
    Dominator EFI Connector J2A Auxiliary Harness;
    $195.95
    $218.00
    $195.95
    Used when adding a second wide band oxygen sensor to a Dominator EFI installation.
  • 558-400.jpg
    Holley EFI
    Connector J1A/B Input/Outputs Auxiliary Harness
    $93.80
    $105.00
    $93.80
    Great for applications requiring minimal Input/output wiring.4 Output Wires4 Input Wires
  • 558-326_01.jpg
    Holley EFI
    LS Ignition Coil Harness; 36 in. Long Extension;
    $103.00
    $103.00
    $103.00
    Designed to extend your factory coil harness, allowing you to easily remote mount your LS ignition coils. These 36 in. long ignition coil extension harnesses are perfect for anyone wanting to remot...
  • 565-300k_09.jpg
    Holley EFI
    Sniper EFI Hyperspark Harness; Plug And Play;
    $167.00
    $167.00
    $167.00
    Our HyperSpark Master Kits were designed to make upgrading your ignition on a Sniper EFI-equipped engine simple. When installed concurrently with a new Sniper EFI system, the combination creates th...
  • 558-325_02.jpg
    Holley EFI
    Pro-Billet Ignition Adapter; For Use w/Terminator X EFI;
    $28.89
    $32.10
    $28.89
    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.
  • 558-323_0119269.jpg
    Holley EFI
    Hyperspark Ignition Adapter
    $29.46
    $32.73
    $29.46
    Designed to plug and play with HyperSpark distributors and Holley EFI main harnesses with an ignition connector, such as part number 558-104.
  • 558-321_0118129.jpg
    Holley EFI
    LS Ignition Coil Harness; Factory Replacement For Stock LS Coils;
    $185.00
    $185.00
    $185.00
    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 va...
  • 558-322_0118236.jpg
    Holley EFI
    TI-VCT Coil ECM Wire Harness; Ignition Harness Type;
    $208.00
    $208.00
    $208.00
    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 jun...
  • 558-319_011812.jpg
    Holley EFI
    Holley EFI Ford Coyote TI-VCT Main Power Wiring Harness
    $113.00
    $113.00
    $113.00
    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 jun...
  • 558-318.jpg
    Holley EFI
    Coil-Near-Plug Ignition Sub Harness
    $208.95
    $233.00
    $208.95
    "Big Wire" Sub Harness- pre wired with 12ga power and grounds, for optimal performance!
  • 558-317.jpg
    Holley EFI
    Holley Ignition Coil Harness; For Use w/Ford Coyote Engines w/HP/Dominator;
    $190.00
    $190.00
    $190.00
    Holley Ignition Coil Harness; For Use w/Ford Coyote Engines w/HP/Dominator;
  • 558-315.jpg
    Holley EFI
    Holley Ignition Coil Harness; For Use w/Ford 4V Modular Engines;
    $179.95
    $200.00
    $179.95
    Coil harness for 99-04 4 Valve Ford Modular (4.6 & 5.4L) Engines.
  • 558-314.jpg
    Holley EFI
    Holley Ignition Coil Harness; For Use w/Ford 2V Modular Engines;
    $200.00
    $200.00
    $200.00
    Coil harness for 99-04 2 Valve Ford Modular (4.6 & 5.4L) Engines.
  • 558-313.jpg
    Holley EFI
    Holley EFI Ignition Adapter Harness; For Use w/FAST Dual Sync Distributors;
    $31.52
    $31.52
    $31.52
    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.
  • large558-312.jpg
    Holley EFI
    HP Smart Coil Ignition Harness
    $186.95
    $208.00
    $186.95
    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...
  • 558-311.jpg
    Holley EFI
    HEMI Coil Harness; Fits w/Gen III Hemi Late Coils;
    $164.00
    $164.00
    $164.00
    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 v...
  • 558-309.jpg
    Holley EFI
    Wire Harness Adapter
    $112.00
    $112.00
    $112.00
    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 ...
  • large558-307.jpg
    Holley EFI
    Universal Coil On Plug Harness; For Use w/HP Or Dominator; Fits w/PN[558-312];
    $138.95
    $155.00
    $138.95
    Universal Coil On/Near Plug Harness €" Use to connect Holley PN 558-312 or factory GM LSx coil harnesses to Holley HP or Dominator ECUs
  • 558-308.jpg
    Holley EFI
    Main Power Ignition Harness
    $81.77
    $90.86
    $81.77
    This Harness is required with HP or Dominator ECUs. Includes, 13 long, 10 AWG main power harness, Qty. (2) 3/8 in. ring terminals and shrink tube (not pictured) . The harness is fuse protected an...
  • 558-306.jpg
    Holley EFI
    Universal Unterminated Ignition Harness; For HP EFI And Dominator EFI;
    $152.95
    $170.00
    $152.95
    Universal Unterminated Ignition Harness; For HP EFI And Dominator EFI;

Showing 625 -648 of 1505 items