aFe Black Series Carbon Fiber CAIS w/Pro 5R Filter 16-18 BMW M2 (F87) L6-3.0LLarge Five Layer Performance Air Filter: This 7 1 2 tall 360 degree radial flow air filter with a 4" flange features our pre oiled Pro 5R media with five layers of progressively finer cotton gauze media for maximum performance. Our Pro 5R media provides your engine with the largest amount of high flowing air, usually resulting in the highest power gains out of all our filter media options. This media is perfect for street and or track use. This Part