the sand will be ok but if i get muddy i will have to clean it after each ride more then likely. They fabbed up that cover on the fly...i was impressed . They normally run the intake through the bed but i need that for my beat! haha. Ill report how it is, but i think the cover, plus the K&N with a extra sock on it should be ok. I just have to pay attention to it and maintain it.
outer wears makes good stuff man haha used them to keep sand outta my rc's back in the day (can sort of see the blue sock on my airfilter in the window haha)