DNA Honda CRF 450R / 250R adds horsepower while letting your dirtbike breathe better. The efficiency of DNA Filters maximizes breathable surface area compared to the OEM filter allowing you to get the most horsepower with 99% clean air filtration.Replacement for Honda OEM: 17213MENA30/ 17213MENA31 TECHNICAL FEATURES Features DNA's advanced FCd (Full Contour design) DNA Fcd air filter flow: CFM (Cubic feet per minute) @1,5" H2O corrected @ 25° Celsius The DNA filter has a 19.4% higher airflow than the stock paper filter! Extremely high filtering efficiency of 98-99%, with 4 layers of DNA Next Generation Premium Cotton These air filters are washable and resusable Drop-In Hassle Free Installation (simply follow the information in the workshop manual) Lifetime Warranty FITS Honda CRF 450R (2009-2012) Honda CRF 250R (2010-2013)