AFE 24 91021 Magnum Flow Pro 5R Replacement Air Filter XDP aFe MagnumFLOW Pro Air Filters for F8X BMW M3 M4 aFe Direct Fit Magnum Pro 5R Performance Air Filter BMW Base 2009 Magnum FLOW Pro 5R Air Filter AFE Spare Filter Dynomotive. This filter features five layers of pre oiled cotton gauze media to provide maximum performance. Its progressive layering allows the filter to flow at high levels even when dirty. This media is perfect for street and or track use. Pro 5R filters are easily recharged with aFe's POWER CLEANER and blue air filter oil. aFe POWER performance air filters use a rounded, evenly spaced pleat design which allows for more usable filter surface area, providing increased flow and greater dust holding capacity. This pliable sealing surface conforms to even the most uneven filter housing, making for a perfect filter fit and sealing surface every time. This design eliminates the use of gaskets or sealants and always goes back to its original form. All aFe POWER flat panel performance air filters are constructed with a full 360 degree polyurethane frame. Unlike other materials that degrade after repeated heat cycles in an engine bay, polyurethane maintains its original molded shape. Features: Washable and Reusable for Multiple Cleaning Cycles 100% Polyurethane Frame on All Sides for Extra Long Filter Life Pro 5R Filter Media Features Five Layers of Progressive Oiled Cotton Gauze for Maximum Performance Deep, Open Pleats Allow for Increased Surface Area, Flow, and Dust Holding Capacity Progressive Bump Seal Design for a Perfect Fit and Sealing Surface Every Time Includes Two Air Filters (Left & Right)