The filter element in the bottom of my airbox was junk, too. I decided to make my own. I took a green Scotchbrite pad, cut two squares to size & held it down with the stock steel piece ("cover, air cleaner element" on microfiche). I'm running a UNI foam style filter so it's tough to tell how much, if any, oil is passing through my setup, but I'll pull the filter out tomorrow and report. I've run about 700 miles on it so far this year with this setup.