aFe 24-91145-MA Magnum FLOW Pro 5R Air FiltersaFe 24 91145 MA Magnum FLOW Pro 5R Air Filters Pro 5R Filter Media: These filters feature five layers of pre oiled cotton gauze media to provide maximum performance. Their progressive layering allows the filters to flow at high levels even when dirty, while their inverted top makes for more filter surface area, resulting in longer service intervals. This media is perfect for street and or track use. Pro 5R filters are easily recharged with aFe's POWER