Twin Air filters are designed to increase airflow while ensuring the highest level of protection from dirt/dust. Design, high quality materials and superior construction deliver unbeatable performance and protection. For Yamaha Bruin/4WD 350 (2004-2006), Kodiak 400 2/4WD (2003-2006), Kodiak 450 2/4WD (2003-2006), Wolverine 450 4x4 (2006-2010), Grizzly 350 (2007-2014), Grizzly 450 (2007-2014).