Hiflofiltro HFF5014 Dual Stage Racing Foam Air Filter Fits: KTM 65SX/XC 97-13, 400 LC-4 Duke 97-04, 620/625 LC-4 Duke 97-06, 640 LC-4 Duke 99-10, 640 Adventure 08-10 Competition off-road air filters manufactured in the Netherlands using a special dual-layer foam, formulated for maximum filtration and optimum air flow for improved power Coarse open-pore foam catches airborne dirt, grime and sand while the fine open-pore inner foam acts as a second filter to trap the smallest particles Top quality materials and superior construction allow the filter to be used over and over again without any loss of performance