This 14-pin Extension Harness is for use with Holley EFI Terminator X and Terminator X Max Stealth Throttle Body harnesses to extend the Throttle Body Bulkhead connection.
This harness is ONLY compatible with Holley Terminator Stealth Main Engine Harness p/n 558-121.
Each build-to-length harness is custom-made to your selected length. We are unable to accept returns on custom-length harnesses.