its from the exhaust,it starts from about 30mph to 45mph +/-.its at a steddy throttle/rpm.give it a little more gas at that moment it goes away. i know it ain't my track,but thats what i experience from my machine & my ears,not studded either. gonna bring my i-pod soon.no more drone,just jams!Blue Dave said:I am starting to think that the "drone" is not so much from the exhaust but rather from the track.