Twin Air's Original Dual-Stage patented design, high quality materials and superior construction deliver unbeatable performance and protection. Twin Air Filters are the hands-down choice of more World and National Champions than all other filters combined. Honda CRF250R 2025CRF250RWE 2025CRF250RX 2025CRF450R 2025 CRF450RWE 2025CRF450RX 2025