Ignitions and Electrical› Ignition Components
Holley
HP EFI Sub-Harnesses - Smart Coil
SKU: H00E 558-312
Moderate — 2–4 hours
Description
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Holley |
| Part Number | H00E 558-312 |
| Weight | 0.95 lb |
Videos
Holley EFI Big Wire Coil-Near-Plug Smart Coil Kit
Holley EFI’s Smart Coil Kits for Coyote and Gen III Hemi Will Support Up To 3,000 Horsepower
Turbo 302 gets Holley Smart Coils!
How to use a Holley EFI 58x Harness on 24x Engines
Hcr Innovation Main Engine Harness for Holley Efi
New Holley efi install advice
What NOT to do with Holley Efi
Holley EFI 12-1 Crank Trigger Kits - The Best Way To Get Accurate Spark Timing
Msd 8000 cdi box With Holley Efi
HCR custom Holley EFI wiring harness
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy