What a difference in sound level! On a scale of 1-10, 10 being loudest I would rate the Flowmaster (3 chamber "quiet" version) an 8, the supersprint a 3, and the stock exhaust a 1. I don't see what some people were complaining about on the board regarding resonance at 2000RPM with the Supersprint. The Flowmaster resonance was at least 4 times louder at 2000RPM, the SS is OK. Only drawback with the Supersprint is just as I had read in the archives. It is a VERY TIGHT fit in the opening (Twin round on a 2.8), and I have noticed the drift toward the driver's side as the exhaust warms up. It goes from almost touching the plastic on the passenger side when cold, to almost touching on the driver's side when hot. And BTW, it was a bitch to get it positioned just right! But I love the sound, just right for me :)) I even got a decent price through the board at $515 plus half off the freight($13 coast to coast). For BMWOCA(sp?) price was $488. Thanks for the advice.