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aFe POWER Magnum FLOW Pro 5R Round Racing Air Filters feature oiled 5-layer progressively finer mesh cotton gauze media for maximum performance. The progressive layering of this media allows the filter to flow at high levels even when dirty. aFe performance air filters use a rounded, evenly spaced pleat design which produces more usable filter surface area for increased flow and greater dust holding capacity. The filter’s progressive bump sealing surface conforms to even the most uneven filter housing. This design eliminates the use of gaskets or sealants. The soft urethane construction always goes back to its original form so you will never compress the bump seal. It’s a perfect fit and sealing surface every time. aFe Power performance air filters are constructed using full 360-degree urethane frames. This construction allows for a proper factory style fit with excellent filter strength. Lastly, aFe Power factory replacement performance filters have a limited lifetime warranty.