Twin Air filters are slightly smaller than stock filters to increase air space around the filter and improve circulation. The resulting increase in air volume around the filter improves circulation within the airbox. More air means more power for your engine. Flow bench tests have proven that Twin Air filters provide increased airflow while reducing the filters tendency to clog. Features • Coarse open-pore foam 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 - KTM 690 Duke R (1993-2002) - KTM 600 LC-4 (1993-1999) - KTM 640 Duke (2008-2010) - KTM 640 LC4 Supermoto (2008-2010) - KTM 640 LC4 (1993-2002) - KTM 350 LC-4 (1993-1999) - KTM 400 LC-4 (1993-1999) - KTM 620 LC-4 (1994-1999) - Maico All (1998-2002) - MZ Baghira Enduro (1997-1997)