K&N's RK Series air intake systems enhance the performance of Harley-Davidson motorcycles by increasing horsepower. Featuring the renowned K&N high-flow air filter, these systems come with a powder-coated, billet aluminum back plate that removes the need for external breathers and incorporates a dyno-tuned velocity stack, maximizing airflow to the engine while maintaining superior filtration. Designed to maintain the bike's stock appearance, the RK Series utilizes the original air cleaner cover.