I have a ZZ4 engine with competition hooker headers which dump into 2 1/4" pipes with hooker aero chamber mufflers which dump at the rear of the car. I kind of wish I had gone with 2 1/2" pipes but i dont want to have to spend money on a whole new exhaust system. I do want to replace the mufflers though. I have not had any experience with any other mufflers except these since this was my first restoration. Im looking for something with more sound but around the same interior noise that I already have. The problem is I dont really have enough experience to compare the noise I have now with any upgraded muffler that I could buy. Any help would be great, Ive heard flowmasters have a problem with interior noise but I dont really know how they compare with the aero mufflers I have now and the little sound clips all the sites have to listen dont really help me out...