The Magnum FLOW OER Air Filter product line up is what got aFe POWER (advanced FLOW engineering, incorporation) started in the late 1990's. We have continued to provide the ultimate air filters available for your gas and diesel vehicles. We design all of our OER Filter (Original Equipment Replacement) to increase horsepower, torque, and acceleration, while providing excellent filtration and protection to your vehicles engine. aFe POWER offers up to three air filter medias to match your driving environment and performance needs.