Well I picked up a nice Laser Duotech exhaust for my 07 650. I got it fitted with a little fiddling and a few trips to the hardware store. It looks great, and at idle it sounds really good. Give it a little gas, sounds great, back off the throttle and both of the baffle inserts make a weird rattly/buzzy wheezy noise. Remove the baffle and the issue is fixed, at least it dosen't have a weird resonance, however the strom is a bit loud running wide open. Anyone else run into this issue with other exhausts? Curious if I can wrap the baffle or something to cut down on the resonance?