tonite i decided to put my muffler on myself instead of payin someone to do it.. well when all is said and done it sounds the same as it did b4.. i put original american thunder flowmaster on it.. and left the tailpipe off. can someone explain why there is no difference???????? very slight difference if any at all..

 

Is this over a stock muffler?


also with new muffler they break in after some time.