I race a gt3 class that wont allow that body, so I use the cadillac atsv. Also the end of next month were going to the usgt tire, no more open tire rule. As far as the tires Im currently running by the way they look I would say they should have a lot left in them, by performance I would say other wise. I'm going to adjust the dual rate a bit and go from there, if I have to take alot out I will try thicker diff fluid. I did try 1.5° rear camber and didnt get any better results.