K&N 33-5132 Replacement Air Filter for Ford Models is manufactured with durable, premium materials and state of the art construction methods to last a lifetime. State of the art air filter media is designed to increase horsepower and acceleration as well as improve overall engine performance. Multiple layers of premium cotton gauze treated with a specially-designed tacking agent work together to create an intricate mesh of engine filter media that is designed to block and trap harmful contaminants. Are pre-oiled and ready to drop into your factory air box- they are one of the easiest and most cost-effective vehicle upgrades for quick performance gains.