K&N Engine Air Filter: High Performance, Premium, Powersport Air Filter: 1991-1999 YAMAHA (YZ125, YZ250, YZ250X, RMZ250, RMZ450, YZ250F, YZ250X 2T, YZ250F, YZ450F, and other select models) YA-2506XD

ULTIMATE LONGEVITY: No-hassle lifetime limited warranty on stock replacement K&N air filters- limitations apply ENGINEERED POWER: State-of-the-art air filter media is designed to increase horsepower and acceleration as well as improve overall engine performance EASY INSTALLATION: Pre-oiled and ready to install. One of the easiest and most cost-effective upgrades for your motorcycle or ATV for quick performance gains. RUGGED CONSTRUCTION: K&N Air Filters are manufactured with durable, premium materials and state-of-the-art construction methods to last a lifetime