This extension harness for 26 Pin J1B Holley EFI Terminator X GM Gen V LT GDI ECU is a build-to-length Holley EFI Extension Harness and is perfect to extend any Holley harness for the GDI Controller p/n 554-150.
Each build-to-length harness is custom-made to your selected length. We are unable to accept returns on custom-length harnesses.