Premium Air Filter. Turner Performance Products has teamed up with Twin Air to bring you a premium, high-quality air filter. Designed to increase airflow while ensuring the highest level of protection from dirt / dust. Two-piece design to trap the smallest particles while still having maximum airflow. Exclusively formulated adhesive ensures glue seams will not break down. Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox, while acting as a breathable gasket for increased air passage. Each filter is designed to precisely meet or exceed O.E.M. requirements. Note: Replaces Yamaha O.E.M. P/N 1HP-E4451-01-00.