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

List Price: $214.92
Your Price: $145.99

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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 Systems for Harley-Davidson Motorcycles]
  • Designed to increase horsepower & torque
  • Dyno-tuned velocity stack
  • Washable and reusable
  • Excellent air filtration

Product Specifications

Estimated Horsepower Gain:10.76 HP @ 5206 RPM
Air Filter Color:Red
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
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)
Part Number:RK-3910-1
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
Replacement Filter:E-3980
Size:9 Inch
Street Legal In All US States:See Application Link Above
Top Material/Finish:Black Powder Coated
Top Style:Metal
TUV Approved (Europe):No
Vacuum Tubing Included:Yes
Weight:3.3 lb (1.5 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Product Reviews

 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
 I buy K&N's for all of my vehicles, because I know they last longer than I have the vehicles and they can be cleaned over and over again. The fitment and quality are top notch. I have used K&N products for over forty years and haven't found anything better.
Ken Darby, Moscow, Idaho
 Good product. Performs exactly as described. Major pain, however, that the kit and installation was not available DURING the Sturgis Bike Rally (where I purchased)!
Rick Stone, Knoxville, Tennessee
 Upgraded my 2008 96ci Rocker-C with a RK-3910-1 and it's like riding a new bike. I am amazed at the difference. More power throughout the band for better 2-up riding. Motor seems to run easier and a bit cooler too. Money well spent. Highly recommend this product!
Rick, Texas