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.