hey man your Z looks beautiful definatly 2 thumbs up, i was reading your thread "track day" and i saw you were using the stock Bridge Stone Potenza tires, mine held up pretty well to, but a week ago i headed back to the track but this time with the stock yokohama advan sports, i think they did a little bit better then the potenzas maybe give it a shot next time if you dont want to spend to much money on tires