Part no 15-6053.FR (oro2u.com)
Can-Am/Bombardier Outlander 400 EFI 03-07, Outlander 400 STD./XT 2008,
Twin Air Two-Stage Competition Air Filter - 156053FR
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 airflow 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 Two Air filters run slightly smalled than stock, making them easier to change and increasing the dead air space around the filter for better performance