K&N Replacement filters are designed for all street legal and off road motorcycles and ATVs to O.E.M. (manufacturers) size specifications and fit into your original OEM air box without modification of jet changes. Due to design and unique high flow characteristics, K&N filters allow engines to breathe free and produce optimum horsepower. Under most conditions K&N air filters never need to be replaced. With proper cleaning and care, K&N air filters will last the life of your engine.