558-307 Holley Performance Engine Control Module Wiring Harness

Universal Coil On or Near Plug Harness – Use to connect Holley PN 558 to 312 or factory GM LSx coil harnesses to Holley HP or Dominator ECU’s.

For Use With Holley HP Or Dominator ECUs

Universal

Connects 558 To 312 Or Factory GM LSx Coil Harnesses

Limited 90 Day Warranty