I was told today that the Uni filter will not stop the very fine dust from getting threw. The guy that I was talking to has about 10 quads between himself and his family. They all go ridding together almost everyweekend. He said that about 2 of the bikes had Uni filters and the rest K&N filters. The ones with the Uni filters had a layer if realy fine dirt between the carb and the airbox, but the K&N bikes did not. Has anyone else seen this. I just got one for my bike a couple of weeks ago and only ridden it onece sence then.