Most drivers prefer a manaul transmission for the track just for the more direct control that it offers. (an unplanned downshift mid-turn in a car with lots of torque could be ugly!) If you're just looking to have some fun, you can surely do that with an auto Vette. (you just have to force your downshifts so that they occur when YOU want them to) If you're going to get into serious competition, you'll probably want a different car, or convert that one to manual. As I'm sure you know, much in the world of motorsports depends on your budget!