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K&N RK-3930 5.0 out of 5 stars 1 Customer Review
Custom Assemblies > Intake System-Harley Davidson

 List Price: $288.07
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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 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.

[More Information on High-Flow Air Intake for Harley-Davidson Motorcycles]
  • Increases horsepower
  • Washable and reusable
  • Fits inside stock cover
  • Provides increased air flow
Available Information
Installation Instruction Sheet
RK-3930 Vehicle Applications
Dyno Chart - 2008 Harley Davidson Road Glide FLTR 1584 8.43HP
Dyno Chart - 2011 Harley Davidson Electra Glide Limited 1584 5.66HP
News Story - 2008 through 2012 Harley Davidson Touring Models Gain Airflow with K&N Air Intake Assembly

Part RK-3930 Product Specifications
Product Style: Motorcycle Intake System
Estimated Horsepower Gain: 8.43 HP @ 3700 RPM
Street Legal In All US States: No
Air Filter Color: Red
TUV Approved (Europe): No
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: Oval
Clamp Material: No Clamps Required
Clamp Style: No Clamps Required
Color: Red
Filter Material: Cotton Gauze
Inlet Diameter: 2.463 in (63 mm)
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Mounting Hardware Included: Yes
Neck Flange: 2.463 in (63 mm)
Overall Height: 1.875 in (48 mm)
Replacement Filter: E-3972
Size: 9 Inch
Style: Oval
Top Material/Finish: Aluminum
Top Style: Metal
Vacuum Tubing Included: No
California Restricted: Not legal for sale or use in California
Total Height: 1.875 in (48 mm)
Weight: 3.5 lb (1.6 kg)
Product Box Length: 11.75 in (298 mm)
Product Box Width: 9.5 in (241 mm)
Product Box Height: 4.88 in (124 mm)

Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Product Reviews      Review part RK-3930

 Excellent system. Puts a lot of air in for dual exhaust to process. At an affordable price too. Highly recommended.
Michael, Hawaii