RK Series High-Flow Intake Assembly

• Product Details

  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.

  • Guaranteed increase in horsepower and torque.
  • Replaces the stock air filter and cleaner backing plate assembly.
  • Fits behind the O.E. air cleaner cover maintaining the factory appearance.
  • Washable, oversized K&N high-flow air filter equals longer life.
  • Oversized black, powder coated aluminum backing plate provides solid mounting.
  • Dyno tuned velocity stack directs airflow to engine.
  • Built-in breathers replace external O.E. breathers (where applicable).
  • Washable and reusable.
  • Excellent air filtration.
  • Includes K&N Million Mile Limited Warranty.

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• Customer Reviews

• Q&A

• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  Black	RK-3942, RK-3940
  Black / 1-5/8 in tall filter	RK-3909-1
  Black / 2-1/4 in tall filter	RK-3910-1
  Black / Standard Capacity	RK-3930

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