aFe 20-91202RM Magnum FLOW Pro 5R Air Filter (Pair)aFe 20 91202RM Magnum FLOW Pro 5R Air Filter (Pair) 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 its 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