OEM part number Harley-Davidson: 29377-08. The K&N air filters are simply replaced with the standard air filters: the standard settings of the carburetor don't t need to be changed. K&N air filters increase the potential of the airbox: K&N air filters have the same service life as the engine. they help extending their lifespan of the engine by protecting it from dangerous dust, sand etc. These air filters are fully washable and can be used again and again without losing filter effect and air flow.
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