Tire tire tire!
A friend last year ran TTB in his 350Z and did a lot of comparison testing at Mid-Ohio. He ended up deciding tire was everything. Ran most (all?) of the season on stock suspension, NISMO diff, a splitter and wing, and as wide a set of A6s as he had points for. He did a lot of testing from 245s up to the expensive extra wide 275 A6. He said the TT director couldn't believe how fast he was with that few mods at Nationals.
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