K&N's lifetime replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N's replacement air filter is custom-designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. Simply remove the disposable air filter and replace it with a K&N air filter; no cutting or fitting is required. The filters are washable and reusable and are backed by K&N's million mile limited warranty.