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K&N RK-3930

Custom Assemblies > Intake System-Harley Davidson
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   8 Customer Reviews
  • Increases horsepower
  • Washable and reusable
  • Fits inside stock cover
  • Provides increased air flow
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 Systems for Harley-Davidson Motorcycles]

Product Specifications

Estimated Horsepower Gain8.43 HP @ 3700 RPM
Air Filter ColorRed
Air Filter Height1.625 in (41 mm)
Air Filter Inside Diameter6.188 in (157 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeNot Flanged
Air Filter ShapeOval
CARB EO NumberD-269-55
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Clamps IncludedNo Clamps Included
Filter MaterialCotton Gauze
Inlet Diameter2.469 in (63 mm)
Mounting Hardware IncludedYes
Neck Flange2.469 in (63 mm)
Overall Height1.875 in (48 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-3972
Size9 Inch
Street Legal In All US StatesYes
Top Material/FinishAluminum
Top StyleMetal
TUV Approved (Europe)No
Weight3.5 lb (1.6 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3930 Product Reviews

Monday, May 16, 2016 - Part RK-3930
Easy to install and superior results when compared to previous setup.

David Trail
Denham Springs, Louisana
Monday, May 2, 2016 - Part RK-3930
Great service, right part, and easy instruction. I am very satisfied.

Clarence Dickerson
Birmingham, Alabama
Thursday, April 7, 2016 - Part RK-3930
Good service. The filter is great quality and fit perfect.

Gerard Michaud
Wednesday, July 8, 2015 - Part RK-3930
Part arrived quickly, and K&N as usual, lives up to their reputation as the best air filters out there. The intake came with precise instructions for installation, everything installed properly and I was back riding in no time. One bonus was that ordering straight from the manufacturer, I saved about $50 over the cost thru other parts stores.

Columbus, Georgia
Tuesday, June 16, 2015 - Part RK-3930
Great easy to install and great performance improvements.

Ken Ziegler
Monday, May 11, 2015 - Part RK-3930
Absolutely love it. I was very much impressed on the increase in power and throaty intake sound.... highly recommended.

Brad Williams
S.E. Texas
Thursday, April 23, 2015 - Part RK-3930
Easy instalation instructions. I have started using K&N filters in all my toys.

Martin Gebert
Stetsonville, Wisconsin