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K&N RK-3910-1 5.0 out of 5 stars 6 Customer Reviews
Custom Assemblies > Intake System-Harley Davidson

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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 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. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1.

[More Information on High-Flow Air Intake for Harley-Davidson Motorcycles]
  • Designed to increase horsepower & torque
  • Dyno-tuned velocity stack
  • Washable and reusable
  • Excellent air filtration
Available Information
Installation Instruction Sheet
RK-3910-1 Vehicle Applications
Dyno Chart - 2010 Harley Davidson Fat Boy 96ci - 10.76hp
News Story - K&N Provides Increased Horsepower and Torque for Twin-Cam Harley-Davidson Motorcycles

Part RK-3910-1 Product Specifications
Product Style: Motorcycle Intake System
Estimated Horsepower Gain: 10.76 HP @ 5206 RPM
Street Legal In All US States: See Application Link Above
Air Filter Color: Red
TUV Approved (Europe): No
Air Filter Height: 2.188 in (56 mm)
Air Filter Material: Cotton Gauze
Air Filter Outlet Shape: Round
Air Filter Shape: Oval
Clamp Material: No Clamps Required
Clamp Style: No Clamps Required
Color: Red
Filter Material: Cotton Gauze
Inlet Diameter: 2.25 in (57 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: 2.25 in (57 mm)
Overall Height: 2.188 in (56 mm)
Replacement Filter: E-3980
Size: 9 Inch
Style: Oval
Top Material/Finish: Black Powder Coated
Top Style: Metal
Vacuum Tubing Included: Yes
Weight: 3.3 lb (1.5 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    See all reviews!  Review part RK-3910-1

 Excellent fit and finish. I can definitely feel the difference in torque over the stock element!
Mike Roberts, Battle Creek, Michigan
 Order was complete and undamaged. Installed in about an hour without difficulty. That includes cleaning the throttle body. Noticable difference in throttle response as well as torque. 50mph in 6th gear roll the throttle smooth acceleration as long as you want to hold it. Works great I would recommend this Kit to everyone.
Bill, Saint Cloud, Florida
 Since installing the K&N intake system on my 2003 Harley Davidson Fat Boy, I have noticed considerable increase in power. My Harley is the 2003 100 Year Anniversary edition and I have several anniversary parts on it, including the breather cover. With this K&N kit, I was able to maintain the use of all specialty features. The kit was very easy to install. I had it completely installed in less than 30 minutes. Thanks again and I look forward to doing more business with you in the future.
Kevin Bearden, Ocala, Florida