I run 12's (front) on my camaro SS. Ran 8's on the rear. I got 8 hours out of them plus about 2500 street miles. VIR and Shenendnoah were the 2 tracks. Running weight was around 3800 @ VIR and 3550 @summit.
They aren't kidding about being "rotor friendly".
I'm debating on 12's or 10's for the turbo coupe'. Weight should be around 3000 w driver. I'd like to get an entire weekend out of 1 set.
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