1999-2006 GM Gen III 4.8/5.3/6.0L EFI Harness

This harness is standalone and is not intended to replace the OEM engine wiring.  Standalone harnesses are intended to run the designated engine & transmission only, generally when swapped into another vehicle.  

For engine swaps only. Not a stock harness. Requires an LS1/LS6 PCM with a 4L60E, 4L65E, 4L70E, 4L80E, 4L85E, or manual transmission. 2003-2006 Engines will require a mechanical throttle body to be installed and engines which were originally flex fuel will require factory truck style injectors to be installed. Does not include connections for the rear O2 sensors or fuel tank pressure sensor but are available separately. Includes a 10-circuit weatherproof fuse block and GM color coded wires with labels.