I have manifolds with stock axhaust with FRPP SVT1 mufflers but the Cats have been burned "gutted" out. The car isn't anything too loud for me. Easily a daily driver. The smell is noticeable but more of a good gas smell for me that I notice in the garage or driving the car but for those that are following behind me it isn't that great. I will most likely be going to Dynatech long tubes, offroad X, and E85 on my next transformation so I will see how that plays out. The X's are more raspy but I have come to like the sound of an x over an H pipe and they make more power so that's the route I will go.