Has anyone had any experience with these filters, supposedly provide 30% additional air while providing superior filtration. I looked around and they seem popular in Europe.
http://www.pipercrossfiltersusa.com/panel_filters/product.asp?m1=45&m2=550&app=3463
http://www.pipercrossfiltersusa.com/panel_filters/product.asp?m1=45&m2=550&app=3463