Reusable air filters

[jwboner]

In my application I use a round air cleaner. I tried a cone and tube but found that I got the air was hotter because the tube ran close to the header and no room to run it anywhere else, so back to the round. I also tried K&N but no matter how little oil I used (less than directions call for) on the filter it got sucked down into the intake system. In my search for reusable filters that have performance in mind I've found cotton gauze, and woven, and foam. The foam doesn't use oil but doesn't seem like a very good filter medium. I have heard of a K&N type filter that's washable, reusable but doesn't need oil, just can't remember who or where. Or maybe I'm dreaming about car stuff too much.