I have an A4, but I think a lot of the M6 guys I know run either Cartek or Textralia clutches. Two cars in particular I'm thinking of hit the track pretty hard and after a year (and many 11 and 10 second N20 infused passes as well as 5-6 road racing days) the Cartek is finally showing signs of slipping. For as much as he beats on his car I'd say the Cartek is a great clutch.
I was about the post the same question. I've almost got 30k on my car and I don't drive it hard at all.... but I've noticed the clutch just doesn't feel the same, the friction point seems like it's farther "out".
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