Looking for some input on what this noise could be.
The noise is coming from the rear end. Hard to describe it, almost like a cyclic rumble/growl that increases with speed. Sounds very much like increased road noise. There doesn't seem to be any play on the rear tires so the bearings should be good (I put in new rear wheel bearings last year).

Something tells me it's coming from the rear differential so I drained the fluid and put in MotoMaster synthetic 75w90 but there was no difference in the noise.

It's not incredibly loud, but definately noticeable with the radio off. I can't really hear it until about 60km/h.

Anyone have any ideas?