Holley EFI 558-117 - Universal MPFI Coil on Plug Main Harness

This harness provides a plug and play upgrade solution for those seeking to convert to Coil-On-Plug. Additionally we have pre-installed a Power Tap for easy access to 12v, 5v Reference, and Sensor Grounds. Built in C-O-P Harness Additional 40 amp relay to power individual coils 20awq gauge wire or larger! Plug and play with 558-312 or 558-318 Smart Coil Sub Harnesses. Dual CANbus Connectors for multiple CAN devices