K&N RK-3910-1 Intake System-Harley Davidson

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 back plate 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. Attributes GTIN: 00024844301697 Brand Name: K&N Color / Finish: Red Filter, Metal Top Estimated Horsepower Gain: 10.76 HP @ 5206 RPM Horse Power Increase: 11 HP Inlet Diameter: 2.25 in (57 mm) Mounting Hardware Included: Yes Oil Included: Yes Overall Height: 2.188 in (56 mm) Package Material: Paperboard Package Type: Bo