It is louder then the stocker, but...that was a very quiet can/cat. It is hard to say, because the Akra doesn't sound like a sewing machine. The Akra is throatier, at idle and not wide throttle, quieter then my 05- 450exc. It isn't aggressively loud, akin to the 950 w/akras, with the inserts in. i was pleasantly surprised, that it is as quiet as it is. The weight difference is pretty amazing, again much like the difference with the stock vs akra on the 950. After riding the 6.9 for 10 min, i turned it off, got off the bike, and touched the titanium of the akra. With the stocker, my hand would have stuck and fried.