aFe 30-10250 Magnum FLOW Pro 5R Air Filter -OVERSTOCKaFe 30 10250 Magnum FLOW Pro 5R Air Filter OVERSTOCK Pro 5R Media: This filter features a 5 layer progressive, oiled media to provide maximum flow with excellent filtration. The progressive layering of media allows the filter to flow at high levels even when dirty. The Pro 5R filter media has been tested at 98. 6 percent efficient. Rounded Open Pleats: aFe performance air filters use a rounded pleat design which produces more usable filter surface