Ok I did some research and found out that K and N makes a filter for the WR/YZF 426 2002 in my case. The part number is YA-4098. I am in the Dragracing business and can tell you first hand that a K and N filter will flow more air and make more horse power than any other filter on the market. However I have read alot of posts on this site that say they will plug up on dusty trailes. I would say that you are right. However I did find out that a company makes a water repelent filter skin of sorts for this filter. Part number WR 22-185-3 and to order on the phone number is 1-800-967-3450. What does evey one think about this???