I have Hankooks on the rear right now, but the Yoko's are pretty awesome in terms of grip. I noticed a considerable difference when I switched as well. Going to switch back once I get back to the states. Maybe go with 305s in the rear as well........
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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