The K&N RK-3930 Air Intake System was designed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary K&N High-Flow Air Filter this RK Series assembly includes an innovative powder- coated billet aluminium backplate 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.

Features:

• Increases horsepower.
• Washable and reusable.
• Fits inside stock cover.
• Provides increased airflow.

Specifications:

• Estimated Horsepower Gain: 8.43 HP @ 3700 RPM
• Replacement Filter: E-3972
• Air Filter Material: Cotton Gauze
• Size: 9 Inch
• Inlet Diameter: 2.469 in (63 mm)
• Overall Height: 1.875 in (48 mm)
• Weight: 3.5 lb (1.6 kg)
• Neck Flange: 2.469 in (63 mm)