as CMT says...its louder at low rpms. its REALLY bassy....and sounds beefier. the mozart screams more than being heart pounding. depends on the sound you're going for. after listening to countless new mp3s of the mozart and watching a few vid's....i like the sound of my triflo a lot more. i LOVE the way it sounds at low rpms...i almost always shift early and keep the rpms low just so i can hear the thing grunt and tell people to get the hell outta the way. im definitely a forever member of the triflo family =)