Hey guys, Ive been reading alot about the exhaust for our cars. Cant really decide, but I know I need somthing. The cars a '07 Gt, all stock and way to quiet. From what I read there is not alot of HP gain from the axle back systems. Does the high flow catted x make a good noise increse? I def want to keep the cats and figured if a high flow h sound alot louder it would be worth it instead of just buying mufflers that only make it louder.