Had to do some re-tuning on this GTO that has Kooks headers, high flow cats & full 3" exhaust, 102 Fast intake, low 230 intake & exhaust duration. Also ported stock heads. This is the "custom" tune that is supplied with this package. Check out the AFR on the log!! Ignore the B2 O2, as I have the WB in it's place.
I also attached a stock tune that I had.
Russ Kemp