Exhaust is personal pref'
Think of it as a straw, they're all different colors and sizes and one may make a different noise when you blow through it. But which do you like better? Can't go wrong w/t Eisenmannzzzz..!
2008 M3 Sedan + catless + Tune
2012 CLS63 AMG
2014 M6 Coupe + catless + KW V3
2015 Porsche GT3