K&N Intake System-Harley Davidson (RK-3909-1)

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.

• 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
• 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 Box Height: 4.88 in (124 mm)
• Product Box Length: 11.75 in (298 mm)
• Product Box Width: 9.5 in (241 mm)
• Product Style: Motorcycle Intake System
• Product Weight: 3.28 lb (1.49 kg)
• Replacement Filter: E-3972
• 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)

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