K&N's "new" YA-4510 High-Flow Air Filter developed specifically for YAMAHA's NEW YZ450F is designed to provide low restriction, resulting in increased throttle-response, horsepower and torque. The deep 7/8" pleated "XD" media provides a large filtration area offering high-flow, long service intervals and excellent filtration. This filter is designed to slide directly into the OE Air Filter Assembly without any fitting or cutting required. Being that the K&N has a built-in back-fire screen, you can remove your possibly restrictive stock backfire screen without any worries. The injection molded Urethane frame offers a pliable sealing bead ensuring a precise, application specific fit and extra long life. K&N High-Flow Air Filters have been made in the USA for over 40 years.