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Designed to increase horsepower and accelerationWorks with factory vehicle electronicsHigh air flow with excellent filtrationWashable and reusable air filterEasy to installThe K&N E-4790 replacement air filter is designed to increase horsepower and acceleration by reducing restriction and increasing air flow to your engine. The E-4790 is made with layers of woven cotton that offer outstanding filtration and can be washed and reused repeatedly. K&N replacement air filters can go up to 50,000 miles before cleaning is required, depending on driving conditions. The E-4790 is easy to install and is custom designed to fit right into the factory air box of select older Ford models and IMPCO industrial engines, as well as other applications.