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- Holley EFI Harness Kits
Superior EFI Wiring Components
An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as important as the power side. This Holley EFI Harness Kit comes complete with the main, power, and injector harnesses to support your primary system!
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Circuit Protectors
EFI Harness
$1,391.95
$1,251.95
SAVE $140.00
Estimated to ship direct from manufacturer Monday
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$907.95
$816.95
SAVE $91.00
Estimated to ship direct from manufacturer Monday
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$822.95
$739.95
SAVE $83.00
Estimated to ship direct from manufacturer Monday
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$798.95
$718.95
SAVE $80.00
Estimated to ship direct from manufacturer on 05/22/25, pending manufacturer availability.
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$798.95
$718.95
SAVE $80.00
Estimated to ship direct from manufacturer on 05/22/25, pending manufacturer availability.
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$861.95
$774.95
SAVE $87.00
Estimated to ship direct from manufacturer Monday
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$798.95
$718.95
SAVE $80.00
Estimated to ship direct from manufacturer Monday
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Universal
Holley 558-424
Holley 558-424 4 ft. Can Extension Harness, For Racepak and other external CAN drives
$54.35
$48.92
SAVE $5.43
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