Just tuned my new G6 today. The stock trans shifts were super soft, now they are just firm enough at part throttle, and quite firm at WOT. I reduced the upshift torque reduction by 50%.
I disabled the AFR & Variable Cam spark tables, then remapped the main spark tables. Of course the knock sensors had to be desensitized even though the spark timing is conservative using 90 octane fuel.
The car is much more responsive now!
Russ Kemp