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Has anyone had any problems with the sport exhaust failing (without and indication lights)? Does tracking damage this temporarily? Brief history for my car for perspective: bought my 2007 C4S with sport exhaust and sport/chrono package as a CPO 2 years ago. The sport exhaust didn't work when I bought it so dealer tried to fix it but didn't work still so they fixed it again. Since then, it worked the vast majority of the time except after my first two track experiences (which by the way were incredible in this car!). I noticed that by the end of each track day I could not hear the sport exhaus