The first day I got my M3W I had the same thing happen to me so I wrapped my exhaust with DEI exhaust heat wrap and never had the same issue again. I also like the old school look it gives as well.

http://www.jegs.com/i/DEI/186/010129/100...wDlPRoCqzDw_wcB


1998 +8
SS Sport tuned exhaust

2013 M3W
Stage ll motor kit
Cats removed