Evening gents, don't know if this is a good idea, or already been discussed, but last time I was on a big trip, when I cleaned my k&n filter it was full of crap. So I was thinking would it be a good idea to place a pre filter, sponge type, on top of the main filter to help it. Would this hinder the air flow, or would this be a good idea? Your thoughts please gents, and please be gentle. Cheers Steve.