most of us have exhaust. for sure changes things up. i waited 2 years before i got exhaust and wow what a difference it makes!
just can't wait to do a primary cat-delete.
2008 M3 Sedan + TestPipes + Tune [sold]
2014 M6 Coupe + AMS Downpipes
2012 CLS63 AMG + P30 PerformancePackage