K&N RK-3909-1 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: 00024844294135 Brand Name: K&N Air Box Included: No Air Filter Color: Red Air Filter Height: 1.625 in (41 mm) Air Filter Inside Diameter: 6.188 in (157 mm) Air Filter Material: Cotton Gauze Air Filter Outlet Shape: Not Flanged Air Filter Shape: Round Air Filter Washable: Yes CARB EO Number: D-269-35/55