The latest addition to KNs RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary KN High-Flow Air Filter the new 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 comes with a larger air filter 2-14 inches tall and longer spacers than the RK-3909.
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