Ya know, I got the exhaust on and did my Revo Stg II at the same time so I can't attest for them individually. However, the sound is low and "basey." Not ricey whatsoever. Here's a sound clip that sounds similar in person (though I haven't fully broken mine in yet)
http://www.youtube.com/watch?v=Cab62NGDHZQ The power difference with the exhaust, test pipe, and stage II upgrade is amazing. I'm really getting so much more power off the line, which I didn't have before. The whole powerband is smoother and the only thing I can compare it to is (with an auto tranny) stage II in normal drive mode (D) is like stage I in sport mode (S). I hope that gives you a better sense of it.
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