My exhaust consist of a megan down pipe 3" exhaust no cats or resonater and a megan can muffler and to say without the silencer its a little to loud is an understatement. So i'm thinking i'm going to add either a cat or a resonater to my exhaust and i was just wondering which would quiet it down the most without robbing a lot of hp the only other option i was looking at eas changing to somthing like a dynomax turbo two muffler or something but i don't realy want to do that lol