What I meant to say was I used a Harley Davisdon pre filter and bolts with the back plate. I just cut out the air box and snorkle and made a little bottom plate and put it togeather.
I like it because you just use water to clean it or if you use oil on it you just use a K@N cleaner plus oil. If you use the oil it attracts more dust.. The filter does not move from the base plate because it has a lip on it. Here is a link of my pre filter very easy and cheap to do. Not bad on the dyno either