Without Sport Crono, PSE is aural only. Might as well go after market, but that's hard in and of itself as some will just drone, sound like crap. If it were me going for aural with some serious tech behind it, i'd look at Akrapovič. Not cheap by any stretch but serious good stuff (i have no affiliation with Akrapovič at all). They had a presentation at PCA's Tech Tactic East last week and it was quite impressive. These guys are serious about exhaust, performance and sound. Nothing wrong with any of that...