These harnesses kits include the main harness and any adapters needed for your application. They are made to work with a cable throttle body (Either OE or converting), 12200411 or 09354896 PCMs, MR Part #997-9200-10 MAF Sensor, and MR Part #997-9101-00 O2 Sensors.
2004 GTO Engine T-56 Trans(LS1 engine)
Cable Throttle Body
MAF Sensor – BRP Hot Rods Part #997-9200-10
PCM – 12200411 or 93544896
O2 Sensor – BRP Hot Rods Part #997-9101-00