A little more "Umph" in my exhaust

Ok well i replaced my stock muffler with a flowmaster super 40 and new piping fromt he muffler back with a 2.5" tip. And it sounds good, but i want it to be louder. how can i open my exhaust a little more, or whats the best way to do so? without it sounding like chit?

hi flow cat.

Change to a cherry bomb exhaust.

New headers (Banks)