I'd go with BFG Rivals or RS3 series II. Rivals last surprisingly long and both are the two stickiest tires out there. I like the RS3s a bit more but I haven't gotten near the life out of them as the rivals. For perspective I autocross at least once a month.
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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