what exactly are you trying to do? a lower profile tire helps in cornering usually, but it doesnt help you in a straight line if you are already lighting up the tires in 1st gear. a smaller tire will make your car feel faster, but you have to be able to get traction.
i actually track my car, i can tell you you should stagger your tires to a minimal and never run wider front tires than the back. i have done it before, scary.....
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