Super dusty is where I live offroad pretty much (tho this time of year we're finally getting some regular afternoon showers). Have used K&N's on a couple of different dualsports here without any catastrophic failures so far. In this sandpit called Florida, a light coat of oil on the inside of the airbox goes right along with cleaning the air filter.
That being said, i've heard the same thing from others about the K&N's, and went as far as buying a uni to replace the K&N that came with my last XRL (that I sold to get this WR).
Think I've a couple of filter sox around here somewhere...
Lovin the WR so far!
Not tagged yet and too loud, but "feels" right. Mostly have just ridden it around the property here since Saturday. Needs geared down abit & some D606's. And some guards, and....