Overview Reviews Product Description 558-439 Holley EFI Terminator Throttle Body Harness Injector upgrade harness for Terminator Throttle Body Systems. This harness is designed to be plug and play with our 205 lb/hr injector upgrade kit, Part Number 522-205. Product Videos Custom Field Product Reviews Write a Review Write a Review × 558-439 Holley EFI Terminator Throttle Body Harness Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *