Twin Air Air Filter Suzuki RM250-400 '79-'80Twin Airs breakthrough, fused dual layer design (now widely copied) combined performance and protection. The fused layers of open pore foam and fine inner foam trap even the smallest particles. The new, rounder design boosts airflow. So do the minimised seams made possible by a revolutionary micro gluing process: Shorter seams = more foam = more flow. Features: Designed for Your Bike: No universal fits at Twin Air 1500+ moulds available for all sorts