Hello dear motor talk team, I have now bought a Smart 451 (2013 year), I mean the facelift model with 71 hp. I want to replace the exhaust system, for a louder one. I got there on the Internet 3 fabulous manufacturers. 1.) Classic Brabus 2.) Asus (but has bad rating) 3.) Rs exhaust (read, it should be loud) Ideally all with Kat please. Do you know any more? You can recommend good hearts to a smart newcomer?