In general wider tires mean more traction but slower handling. I wouldn't see any reason to deviate from the stock tire sizes.
Go for the new pilot power 3's, I have them on my Z and they're sweet. Warm up fast, super grippy, very stable in corners. Tread life is better than expected also, I'll expect to get 7 or 8k from the rear, and I don't baby it around either.
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