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550-605 | HP ECU AND UNTERMINATED HARNESS KITclose
Looking for a plug and play alternative for your stock or built late model factory EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and..
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550-605N | HP ECU AND UNTER, HARNESS, NTKclose
Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition..
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550-606 | FORD MPFI HP ECU AND HARNESS KITclose
Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition..
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550-606N | HP ECU AND HARNESS, FORD MPFI, NTKclose
Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition..
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554-123 | 4 CHANNEL COIL DRIVER, NO HARNESSclose
The four channel coil driver module is a "dumb coil" driver module that plugs into the main harness, which is needed when running the factory coils. Contains one 4-channel driver.Features:Four channelPotted design allows installation in engine compartmentBrandHolley EFIEmission Code5Product TypeHigh Current Driver - ModulePart Number554-123..
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554-142 | INJECTOR DRIVER MODULE, W/ HARNESSclose
Introducing the Holley EFI Programmable 8 Channel Injector Driver Module. The ultimate solution for methanol burning engines that require a large set of secondary injectors. The Holley EFI Injector Driver Module will have you in complete control of your fuel injected behemoth, featuring easily programmable injector current curves, injector test fire mode, two datalogger outputs, multiple peak and ..
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554-143 | INJECTOR DRIVER MODULE, W/O HARNESSclose
Introducing the Holley EFI Programmable 8 Channel Injector Driver Module. The ultimate solution for methanol burning engines that require a large set of secondary injectors. The Holley EFI Injector Driver Module will have you in complete control of your fuel injected behemoth, featuring easily programmable injector current curves, injector test fire mode, two datalogger outputs, multiple peak and ..
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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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