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 Clamp Color/Finish: Not Applicable Clamp Material: No Clamps Required Clamp Style: No Clamps Required Clamps Included: No Clamps Included Color / Finish: Red Filter, Metal Top Couplers Included: None Estimated Horsepower Gain: 6.05 HP @ 5206 RPM Horse Power Increase: 6 HP Inlet Diameter: 2.25 in (57 mm) Mass Air Flow Sensor Adapter Included: No Mounting Hardware Included: Yes Neck Flange: 2.25 in (57 mm) Oil Included: Yes Overall Height: 1.688 in (43 mm) Package Material: Paperboard Package Type: Box Product Style: Motorcycle Intake System Replacement Filter: E-3972 RPM: 5206 Size: 7 Inch Street Legal In All US States: See Vehicle Applications Style: Oval Top Material: Black Powder Coated Top Style: Metal TUV Approved (Europe): No Warranty: No-Hassle Lifetime Limited Weight: 3.3 lb (1.5 kg) Extended Information Country of Origin: Life Cycle Status: Emissions : Packing Information Quantity of Each: 1 Package UOM: EA Dimension: 11.7500 x 9.5000 x 4.8750 inches Weight: 3.2800 lb PDF PDF: