Magnum FLOW OE Replacement Air Filter w/ Pro 5R Media 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 and is targeted toward performance street and/or track applications. 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 air filters are constructed with a full 360-degree polyurethane frame. The Pro 5R media is easily cleaned with aFe POWER CLEANER and water and is recharged with our industry leading air filter oil.