Toyo R888's worked for me at 760rwhp/715rwtq on my last 350z... Only spun through second gear on a good day. I'm sure with 500rwhp you wouldn't have much problems in second gear. 1st gear is definitely gone though.
But spinning halfway through 4th gear at only 475rwtq? I'm thinking it's just your alignment that's off.
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2010 370Z 40th Anniversary - Anastasia
VENACI / AERO JACKET / HKS USA / MXP / NISMO / FALKEN / STILLEN / T1R / MR WORKS / CARBON SIGNAL / EVO-R / BLUE BATMOBILE
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