PART NO. 15-8089.TA BETA XTRAINER 250 2023 - 2025 XTRAINER 300 2023 - 2025 RR 125 2020 - 2024 RR 200 2020 - 2024 RR 250 2020 - 2024 RR 300 2020 - 2024 RR 350 2020 - 2024 RR 390 2020 - 2024 RR 430 2020 - 2024 RR 480 2020 -2024 RX 300 2024 - 2025 RX 450 2024 - 2025 TWINAIR STANDARD FILTER 158089 Twin-Air dual-stage filters are used by factory race teams and leading riders around the world Dual-bonded foam design removes even microscopic dirt particles, yet allows more air flow than regular "two separate layer" filters (flow bench tested) Flat foam sealing ring maintains a secure seal to the airbox, even in the worst riding conditions Twin Air filters run slightly smaller than stock, making them easier to change and increasing the dead air space around the filter for better performance.