I just recently got a firebird and it has new exhaust but it has a dynomax muffler on it and its not loud at all. I want it as loud as possible with out straight pipes. I do have a gutted cat and 3 inch pipes from the stock manifolds for now until i get a set of headers. I was looking at the cherrybomb crossflows because i know cherry bomb makes loud mufflers. If anyone else has some suggestions. i am going to be running 4 inch exhaust tips