Air box open or closed?? Closed K&N is fine and will be a great filter. I have a DS and LT500 that I ride Open AIr box I was a K&N man, but after the 5th re ring on my LT I kept seeing this VERY fine dust and oil through the intake tube, if thats sand, thats like emery paper going through your motor, I went to a no toil, with a wrap, and havent seen teh dust layer, but you do loose a few ponies, did the same on the DS because its a nikasiled cylinder, the way I look at it if you race and dont mind the teardowns and rebuilds K&N is fine, but with 2 strokes I rather lose a few HP and have the motor compression last a few more trips.

 

k+n all the way

 

STOCK air filter all the WAY!!! LOL, nothing to worry about just as good for your quad and dont have to worry about all the stuff these guys are talking about, ok! LOL my 2 cents there...hehe