Overview Reviews Product Description 558-318 Holley EFI C-N-P Ignition Sub Harness "Big Wire" Sub Harness- pre wired with 12ga power and grounds, for optimal performance! Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-318 Holley EFI C-N-P Ignition Sub Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *