just wanted to post a heads up on the new filter from twinair. if you haven't seen the previous post, twinair has added the wr to the list of bikes that have the new back fire (proof?) air filter. it's the same size as oem and will fit on you stock filter cage. it allows you to remove the backfire screen from the cage. some tuners claim the screens are a big problem when it comes to four stroke performance. like these things wont go fast enough! now the heads up part. the screen in our wr's cage is molded in. it doesn't just pop right out. it's just under the surface of the plastic but in it none the less. expect to spend some time cleaning up all the little rough edges. if a small piece should break off it could cause a real problem. i used a small dremel like tool to grind all the wire out that i could. i'll report if it weakens the cage in anyway. we're about to get a pretty good cold snap here in st.louis, so it may be a bit before i ride again.