E-3806RDesigned to increase horsepower and accelerationDesigned for racing applicationsWashable and reusable lifetime air filterDual cotton layersOne year limited warrantyThis K&N racing air filter is made with 2 layers of cotton and does not come oiled. It was designed to provide even lower air restriction than our replacement air filters for street vehicles. K&N racing air filters are washable and reusable and come with a one year limited warranty.