Holley Motorsport Grade Wiring Harnesses

Supported ECU Platform
This wiring harness range is designed specifically for Holley systems and is built to the same motorsport ETFE M22759/16 standard used across all supported ECUs.

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Our Holley Motorsport Grade ETFE MIL-W-22759/16 wiring harnesses are purpose-built for HP EFI and Dominator EFI series ECUs used in motorsport, performance street builds, and professional engine swaps.

Each loom is hand-built using race-grade M22759/16 ETFE wire and designed specifically for Holley ECU pinouts — not universal or generic harnesses.

Select your Holley ECU model below to find a wiring harness engineered for heat resistance, signal integrity, and long-term reliability.