first question to answer is how much tire you can stuff on a 10 in wheel and be within tolerance. Cjwsrt6 answered that. TireRack site also gives that info on any given tire.
Next, what kind of camber spec are running? Having aftermarket camber arms don't imply you are on stock specs. Someone with a negative 4 degree camber can run wider tires than a stock camber spec 370z.
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