K&N RU-1780 Round Clamp-On Air Filter are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5 mm) to fit in-between sizes. When used as a replacement for the OEM air filter, modifications to the jetting may be required.