I use Michelin Cup 2 and Hankook Z214 depending on which class I run. The 2sec improvement on my partner's e92 M3 was on NT01 before and after TTX.
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Current: 2015 C200 / 2018 Cayenne / 2012 370z / 2012 C250 Coupe
Gone: 2013 Cayenne / 2004 Cayenne S / 2003 SL55 AMG / 2008 C300 / 2006 350z / 2006 C280 4Matic
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