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558-101 | TPI/STEALTHRAM MAIN HARNESSclose
GM Tuned Port / Holley Steathram Engine HarnessBrandHolley EFIEmission Code3Harness ApplicationTPI/ StealthramHarness TypeMainProduct TypeTPI - Stealthram Main Engine HarnessPart Number558-101..
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558-104 | UNIVERSAL MPFI MAIN HARNESSclose
Universal MPFI Main Harness for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationFordGMUniversalHarness TypeMainProduct TypeUniversal MPI Main Engine HarnessPart Number558-104..
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558-105 | UNTERMINATED MAIN HARNESSclose
BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeMainProduct TypeUniversal Unterminated Main Engine HarnessPart Number558-105..
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558-108 | MAIN HARNESS, 99-04 FORD MODULARclose
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..
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558-110 | MAIN HARNESS, FORD COYOTE TI-VCTclose
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..
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558-113 | MAIN HARNESS, 99-04 FORD MODULAR, W/ SMAclose
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..
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558-117 | UNIVERSAL MPFI W/ COP MAIN HARNESSclose
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..
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558-118 | FORD MPFI W/ COP MAIN HARNESSclose
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..
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558-121 | 2X4 TERMINATOR STEALTH MAIN HARNESSclose
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..
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558-122 | MAIN HARNESS, FORD COYOTE TI-VCT SMARTclose
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..
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558-124 | SUB HARNESS, FORD COYOTE TI-VCTclose
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..
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558-125 | SUB HARNESS, FORD COYOTE TI-VCTclose
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..
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558-126 | FLYING LEAD MAIN HARNESSclose
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 ..
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558-200 | V-8 INJECTOR HARNESSclose
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..
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558-202 | UNIV. 4 CYL. INJ HARNESSclose
BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeInjector Harness - ConnectorPart Number558-202..
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558-203 | UNIV 6 CYL INJ HARNESSclose
BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeInjector Harness - ConnectorPart Number558-203..
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558-204 | UNIV. UNTERMINATED INJ HARNESSclose
Universal Unterminated Injector Harness for HP EFI & Dominator EFI(Bosch EV1 style).BrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeUniversal Unterminated Injector HarnessPart Number558-204..
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558-206 | 2 x 4 TBI INJ HARNESSclose
2x4 BBL Holley TBI Injector Harness for HP EFI & Dominator EFI BrandHolley EFIEmission Code3Harness ApplicationTBIHarness TypeInjectorProduct TypeThrottle Body Injector HarnessPart Number558-206..
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558-207 | UNTERMINATED 16 INJ HARNESSclose
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..
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558-208 | UNTERMINATED 24 INJ HARNESSclose
Unterminated 24 injector MPFI harness Terminated at injector connectors (Bosch style). Harness must be assembled and require crimping Metripak 150 connectors. Includes all connectors, pins, terminals, and loom needed. for HP EFI & Dominator EFIBrandHolley EFIEmission Code3Harness ApplicationUniversalHarness TypeInjectorProduct TypeUniversal Unterminated Injector HarnessPart Number558-208..
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