Hiflofiltro HFA4918 Premium OE Replacement Air Filter Replaces OEM Part Numbers: Yamaha 4XY-14451-01 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 or exceed 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