K&N High Flow Race Air Filter Yamaha YZF-R1 09-14
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These air filters are for asphalt racing use only. It is not intended for a dirt track, off-road or highway use. The specially designed 2 ply air filter is less restrictive and produces more air-flow CFM (cubic feet per minute) for race specific engines. K&N racing air filters are designed to increase horsepower and acceleration. K&N air filters are hand made in the United States and are constructed of the finest materials. K&N has developed racing filters for just about every form of racing in the world.