When I got my flash it did change the sound of the exhaust slightly on a stock system. It was a tad deeper and a little louder. But no pop, because of the cats I do believe.BDR SRT-10 said:Hell yes I love that sound when decel'n... When folks pass by me or are beside me in town coming up to a stoplight or something, they know something's a little different about my truck... I can tell by the look on their faces...Priceless IMO :rock: !!! One question, does a reflashed PCM have any effect on the noise??