Holley EFI 558-321 Replacement Coil Sub Harnesses for 2005+ Stock LS Coils


  • Brand: Holley EFI
  • Harness Application: GM LSX
  • Harness Type: Ignition
  • Product Type: LS Coil Harness
SKU: HLY558-321 Category:

Are you tired of scouring the junkyard for stock ls coil sub harnesses? Introducing the new Holley EFI LS Coil Sub Harness. This coil sub harness is intended to be used with factory LS coils and various Holley EFI main harnesses with Coil-on-plug connectors. The Holley EFI LS coil sub harnesses are built with the same high quality connectors and wire loom found on all Holley EFI harnesses, guaranteeing a perfect match in your engine bay.

  • OEM connectors provide a secure connection between your ECU and Ignition Coils
  • Techflex F6 braided wire loom keeps your engine bay looking clean, while providing abrasion resistance
  • Plug & Play fitment
  • Can be used to replace a damaged factory coil harness
  • Fits Truck Coils, and 2005+ LS Car engines.
Weight 0.5 lbs
Dimensions 6.5 × 4.2 × 5.9 in




Not CARB Compliant

Manufacturer Part Number


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to