CUSTOM AIR FILTER SET K&N RK-3947

K&N Universal Air Filters with Clamp K&N universal air filters are designed and manufactured for a wide variety of applications. No matter the angle or the outer diameter of the air intake, there is a K&N universal air filter for your equipment. All filters are built with ultra-strong molded flexible rubber flanges that absorb vibration and allow for a secure fit, and they can also stretch up to 1/16 (1.5 mm) to fit intermediate sizes. K&N universal air filters are available in round, conical (cone style), and oval designs for almost any special application. Select a type of universal filter below to see the available sizes.