I have the Stainless Works cat back and my passenger looks like its been hit a few times by the axle, prolly just from hard hits But I don't really bother me. Your should try going cat less if your set up isn't loud enough it'll really wake up the sound.
2011 Gt, Mt-82, C&L cai, SSW catback
Bama can tune, gutted cats
Godspeed wheels 20x8 up front 20x10 on rear
Raxiom switchback turn signals, Black billet grill
Tinted tail lights and markers