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There's nothing wrong with your car... stop wasting your time. The noise is normal across the board with cars with aftermarket cats.
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2008 M3 Sedan + catless + Tune
2012 CLS63 AMG
2014 M6 Coupe + catless + KW V3
2015 Porsche GT3 , 2015 M3, all stock, 1/1 Space Grey |