at idle it just humm's, not loud at all.
cruising speed 3000rpm'ish its noticable, but not loud at all, you can still hear the radio.
wot, you'll hear it, and its kinda loud, but not buzzy sounding. there are sound clips floating around the site...
it is much less Kazzoo-like than other rice exhausts. It is louder than stock and you can really hear it when the car is cold. Especially whrn the engine is still col.d after a while those it mellows out and you can't notice it as much. but it is still a step above stock.
I absolutely love mine.