I know there selling the aluminum air box tube from speed werx for $59.95 I ordered a plastic one from my arctic cat dealer for a 02 - 03 440 snopro. It cost $12, took the stock F7 one out. Had to trim air box opening a little for it to fit in. You have to take a quarter of an inch off all the way around the opening. You have to buy 3 screws to hold it in. Its a 4 inch straight tube like the aluminum one. It only goes in correctly one way, you will see what I mean when you install it. I also put some silicon sealer under the lip to make sure it sealed up nice. Hose goes right on. Fits nice and looks factory ! $12 is better than $59.95 ! Now I have to get some snow to try it out ! Nothing wrong with saving a little $$$$ P.S. here is the part # 1670-315