Put racing soft tires on it yet? Camber: Fr.-2 / Rear -1? Got an adjustable wing? The base GT '06 is pretty good (tuned: 882Hp @ 1203 Kg) an easy win at Laguna Seca Extreme. If you have understeer on the corners, try increasing the ABS, it's not a crime to use the aids. The best GT, IMO, is the LM race car spec II. (tuned: 804Hp @ 1130Kg) You win this one or get it from the UCD. Loads of down force and can blow any of the regular competition away in "like the wind".