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Holley EFI Systems Wiring Harnesses

4.77 out of 5 stars 31 Customer Reviews

Holley offers a variety of direct replacement EFI wiring harnesses, including multi-port, sequential, and throttle body injection styles. These units are made with premium components to ensure better reliability and performance for your ride--and they're compatible with many engine swaps. Holley EFI systems wiring harnesses are sold individually or as a kit; choose the model needed for your fuel injection application.

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Holley EFI Systems Wiring Harnesses 558-505

Fuel Injection System Wiring Harnesses, Holley EFI, 2V Modular EFI, with Main, Power, Injector Harnesses, for HP, Dominator ECU, Ford, 4.6-5.4L, Kit

Part Number: HLY-558-505

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Estimated Ship Date: Oct 8, 2025 if ordered today

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Estimated Ship Date: Oct 8, 2025 if ordered today

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