It depends on the local club. Our club doesn't allow R comps in stock class, but SCCA and most others will. The street/race tires from Bridgestone/Kumho/Nitto/Hankook/Yokomama are about 1.5-3 sec slower than A6s, but it will be way better than your stock or the stupid V12s or whatever. It's an expensive way to go, but the better tires are better than any stupid spring setup you are going to put in your car. I believe Tirerack tested a full spring kit, the car gained .4 sec on their 30 sec course or something, which is nothing compared to a set of decent tires.
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