Twin Air Filter and Keepitroostin Sticker Fits Suzuki Drz400 2000-2013 Fits Honda Crf450r 2009 2010 2011 2012 Twin Air is the choice of more World and National Champions than all other airfilters combined. Coarse open-pore catches airborne dirt, grime and sand. Fine open-pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum air passage. Exclusively formulated adhesive withstands repeated cleanings, even with harsh solvents or gasoline. Thick, flat foam, greaseless sealing ring ensures maximum contact with your airbox, while acting as a breathable gasket for increased air passage. Fused outer and inner elements prevent dirt and grime from being lodged between layers, unlike Twin Air, this can be a problem with inferior two piece designs. Trapped particles can restrict airflow. And if dirt works its way into your engine, a pinhead sized granule will gouge your cylinder, piston and rings like a bullet.