it's dead silent all the way up till 75. then the combo of intake and exhaust gets a little drony from 85 on. going around town, you can't really hear it inside the cabin. my friend driving in back of me said you can definitely hear the growl from behind upon accleration. when you first get on it and (if you have an intake) your intake hasn't started its growl yet, you can hear a nice deep rumble from the exhaust for a brief moment. it sounds sweet. the beauty of this exhaust is that it gives close to 5whp gains but is subtle enough that it's not obnoxiously big nor obnoxiously loud. combine that with every day drivability (no droning on your way to work unless you're hauling ass at 85) and it's a winner!