So I have a 03 pro-x 800. Everytime I hit a drift snow gets in the air box then it will run like shit. All of my filters are good, and the seals between the carbs and the air box. I can't figure out how it's getting in there and it's very frustrating because everytime I have to take it apart and clean it. Any ideas? Also if I put some k&n filters on would I have to change jetting? Thanks eveyone.