I just got my Uni- Filter (Air) in last week. Unlike the dirt bike ones, this one has a permanent piece of foam on the inside about 1/2/ inch thick. The outer surface is a metal perforated sheet. Cleaning will be a little bit more of a pain, since the foam doesn't come out. It is suppose to replicate the stock air flow. Cost was $34.95. Of course since I am not well versed on posting pics, you wont see it. Now if somwebody tells me how to post i'll put a photo of it on this page.