Well, about 5 billion people may come out of the wood works and tell you how a K&N filter is junk and they don't work, blah, blah, blah...

I have run K&N filters for a long time (20+ years) in AZ dirt and dust, never had a problem. I have also always run either the foam pre-filter or the micron mesh pre-filter with great success.

Yeah, you still need to clean the filters.