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K&N RK-3910-1 Intake System-Harley Davidson

Custom Assemblies > Intake System-Harley Davidson
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   17 Customer Reviews
  • Designed to increase horsepower & torque
  • Dyno-tuned velocity stack
  • Washable and reusable
  • Excellent air filtration
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.

[More Information on High-Flow Air Intake Systems for Harley-Davidson Motorcycles]

Product Specifications

Estimated Horsepower Gain10.76 HP @ 5206 RPM
Air Filter ColorRed
Air Filter Height2.188 in (56 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
Air Filter ShapeOval
CARB EO NumberD-269-35/55
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Clamps IncludedNo Clamps Included
Inlet Diameter2.25 in (57 mm)
Mounting Hardware IncludedYes
Neck Flange2.25 in (57 mm)
Overall Height2.188 in (56 mm)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
Product StyleMotorcycle Intake System
Replacement FilterE-3980
Size9 Inch
Street Legal In All US StatesSee Application Link Above
Top MaterialBlack Powder Coated
Top StyleMetal
TUV Approved (Europe)No
Weight3.3 lb (1.5 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3910-1 Intake System-Harley Davidson Product Reviews

Wednesday, December 7, 2016 - Part RK-3910-1
Awesome Product. Finally got that sock out of my intake.

Chad Brown
Irondale, Alabama
Friday, November 11, 2016 - Part RK-3910-1
Wonderful product, sold by a wonderful company. I orders the wrong air filter for my 2006 Road King. I contacted the company and they made immediate actions for me to return the wrong air filter. Their salesman even helped me get the correct filter ordered. I love doing business with this company!

Mustang, Oklahoma
Tuesday, September 20, 2016 - Part RK-3910-1
Had no trouble installing. I did stage 1 at same time. Bike runs extremely better.

Larry Orr
Alameda, California
Monday, September 12, 2016 - Part RK-3910-1

Darryl Buxton
Wednesday, September 7, 2016 - Part RK-3910-1
Great product but the instructions need to be redone to eliminate guess work in the instalment. The pictures don't match the written instruction. The lack of clear guidance in the instructions is the only thing keeping me from giving this product 5 stars.

Tim Murphy
Colorado Springs, Colorado
Thursday, May 26, 2016 - Part RK-3910-1
Easy to install. Cover/cleaner sticks out a little farther than stock, but not an issue. She's defiantly breathing better, seems to be pulling harder.

Kevin Wood
Thursday, April 28, 2016 - Part RK-3910-1
Part No.RK-3910-1 does not fit my application as mentioned on their site. I called customer service and had the privilege of working with James M. I couldn't be happier with how he handled the situation. I received the correct part last night and I am looking forward to installing it. K&N makes great products and I will continue to use them in all of my vehicles.

Brian D