Hiflofiltro air filters are manufactured to fit the factory air box and are a direct replacement for original equipment filters. Using top quality powerflow filtering media, developed for modern high performance engines, these filters meet OEM specifications. No need to change carburetor jets or settings. Providing unbeatable performance and exceptional value, Hiflofiltro is the best-selling brand of aftermarket filters for motorcycles, scooters, and ATVs worldwide. Replaces OEM numbers: Yamaha 20S-14451-00