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K&N CUSTOM ASSY KRK-3909-1

K&N CUSTOM ASSY KRK-3909-1 KNRK39091

  • 49790

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K&N's RK Series was developed to get more horsepower from your Twin Cam® Harley-Davidson® engine. Built around the legendary K&N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum backplate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1.

Designed to increase horsepower & torque
Dyno-tuned velocity stack
Washable and reusable
Excellent air filtration


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