Thanks for the info. What about the size? I'm thinking about 255 in the rear because right now they can't quite hold the power in end of 1st / beginning of second, especially when using Launch control.
I'm stock (N55) with the performance exhaust; I may buy a JB4 (or the new Hartge tune...) but I'm not planning to go any further than a tune.
Based on your XP will the PSS in 245 be grippy enough?
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