Twin Air is the choice of more World and National Champions than all other airlters combined. For more than 40 years, Twin Air has provided the greatest names in motocross with performance and protection; Ricky Carmichael, Stefan Everts (10-times world champion), Roger DeCoster, Eric Geboers, Jeremy McGrath, Kevin Windham, David Thorpe, Travis Pastrana, Jean Michel Bayle, Greg Albertyn and Scott Summers to mention just a few.Some of these great names are now Race Team managers and still rely on TwinAir performance and protection; Roger DeCoster, Stefan Everts, Sylvain Geboers, Heinz Kinigardner, Kees v/d Ven, Pit Beirer to mention just a few.Every Twin Air lter is constructed from two layers of open-pore foam that are bonded together to provide maximum ltration and superior airow. A coarse-foam outer shell is ame laminated with a ne-foam inner core, resulting in a onepiece design that is both functional and durable.The one-piece design permits continuous ltration and airow while protecting your engine from dirt, dust and even sand. A thick, soft-foam sealing ring provides maximum contact with your airbox, even in the worst riding conditions. The sealing ring acts as a breathable gasket allowing air passage while restricting dirt and dust. Whether you are riding through the woods, across the wide open desert, or at your favorite track, you can depend on Twin Air providing your engine with lots of clean air. If Twin Air can't keep your engine clean, no other lter can!Twin Air lters are designed to increase air volume around the lter to improve airow into the intake. More air means more power for your engine.