That's a tough one, the wide body cars sit on a 345/35-15 stock with a total diameter of 24.5" making them sit low, a 355/30-19 is 27.4" so IMO they end up looking too high off the ground. Like stock though I'd say a Pirelli is a the best choice in a P-Zero. If it's not too late you can get more than enough brake under a 15" wheel to go for the Campi wheel and true Group 4 look!
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