Features: DESIGNED TO FIT IN THE FACTORY AIR BOX EXACTLY LIKE ORIGINAL FILTER THE BEST SELLING REPLACEMENT AIR FILTER FOR COMPETITION MOTORCYCLES AND ATVS UNIQUE TWO STAGE DESIGN ALLOWS FOR EASY AND COMPLETE CLEANING DUAL LAYER OF FOAM, CAN BE SERVICED SEPARATELY THIN ULTRA SEAL BASE IS VIRTUALLY IMPOSSIBLE TO TEAR AND HAS A BUILT-IN "GREASE GROOVE" USED BY FACTORY YAMAHA, KAWASAKI AND SUZUKI OFF-ROAD Designed To Fit: 2004 Yamaha YFZ450 2005 Yamaha YFZ450 2006 Yamaha YFZ450 2006 Yamaha YFZ450 Bill Balance Edition 2007 Yamaha YFZ450 2007 Yamaha YFZ450 Bill Balance Edition 2007 Yamaha YFZ450 SE 2008 Yamaha YFZ450 2008 Yamaha YFZ450 SE 2009 Yamaha YFZ450 2009 Yamaha YFZ450R 2009 Yamaha YFZ450R SE 2010 Yamaha YFZ450R 2010 Yamaha YFZ450R SE 2010 Yamaha YFZ450X 2010 Yamaha YFZ450X Bill Ballance 2011 Yamaha YFZ450R 2011 Yamaha YFZ450R SE 2011 Yamaha YFZ450X 2011 Yamaha YFZ450X SE 2012 Yamaha YFZ450 2012 Yamaha YFZ450R 2012 Yamaha YFZ450R SE 2013 Yamaha YFZ450 2013 Yamaha YFZ450R 2013 Yamaha YFZ450R SE 2014 Yamaha YFZ450R 2014 Yamaha YFZ450R SE 2015 Yamaha YFZ450R 2015 Yamaha YFZ450R SE 2016 Yamaha YFZ450R 2016 Yamaha YFZ450R SE 2017 Yamaha YFZ450R 2017 Yamaha YFZ450R SE 2018 Yamaha YFZ450R 2018 Yamaha YFZ450R SE 2019 Yamaha YFZ450R 2019 Yamaha YFZ450R SE 2020 Yamaha YFZ450R 2020 Yamaha YFZ450R SEManufacturer Part Number: NU-3218ST