Gregger
Living Legend
Not having heard what the newer 2500 cc engines sound like I'd almost say that was normal. Wish we would have heard this sooner because it isn't an exhaust leak for sure. Could be gear train, bearing noise or even cam chain whine but there definitely isn't any ticking or valve train lash noise. Maybe you should get a louder exhaust. 
Did the dealer say it was OK?? If so, I'd ride it. What oil are you using?
Did the dealer say it was OK?? If so, I'd ride it. What oil are you using?