K&N 's lifetime replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road. These filters are 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; there is never any cutting or fitting required. Our stock replacement air filters for street vehicles are covered by our famous K&N million-mile limited warranty.