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K&N RK-3930 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   5.0 out of 5 stars   12 Customer Reviews
  • Increases horsepower
  • Washable and reusable
  • Fits inside stock cover
  • Provides increased air flow
The K&N RK-3930 Intake System-Harley Davidson fits some Harley Davidson FLHP Road King Police, Harley Davidson FLHR Road King, Harley Davidson FLHRC Road King Classic, Harley Davidson FLHRSE4 Screamin Eagle Road King, Harley Davidson FLHT Electra Glide Standard, Harley Davidson FLHTC Electra Glide Classic, Harley Davidson FLHTCU Electra Glide Ultra Classic, Harley Davidson FLHTCU Ultra Classic Electra Glide, Harley Davidson FLHTCUSE5 CVO Ultra Classic Electra Glide, Harley Davidson FLHTCUTG Tri Glide Ultra Classic, Harley Davidson FLHTK Electra Glide Ultra Limited, Harley Davidson FLHTP Electra Glide Police, Harley Davidson FLHX Street Glide, Harley Davidson FLHXXX Street Glide Trike, Harley Davidson FLTR Road Glide, Harley Davidson FLTRU Road Glide Ultra, and Harley Davidson FLTRX Road Glide Custom models. See vehicle applications link for details.
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
Replacement FilterE-3972
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Product StyleMotorcycle Intake System
Size9 Inch
Air Filter ShapeOval
Air Filter Height1.625 in (41 mm)
Air Filter Inside Diameter6.188 in (157 mm)
Air Filter Outlet ShapeNot Flanged
CARB EO NumberD-269-55
Street Legal In All US StatesYes
TUV Approved (Europe)No
Inlet Diameter2.469 in (63 mm)
Overall Height1.875 in (48 mm)
Top StyleMetal
Top MaterialAluminum
Clamps IncludedNo Clamps Included
Clamp StyleNo Clamps Required
Clamp MaterialNo Clamps Required
Weight3.5 lb (1.6 kg)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
Couplers IncludedNone
Mounting Hardware IncludedYes
Neck Flange2.469 in (63 mm)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3930 Intake System-Harley Davidson Product Reviews

Friday, April 21, 2017 - Part RK-3930
Great product fast shipping. This is the second one I have purchased and installed on two different bikes. Good add on.

Charlie Andrews
Siler City, North Carolina
Thursday, February 16, 2017 - Part RK-3930
Great product. Shipped fast.

Kenneth Johnson
Cromwell, Indiana
Saturday, September 24, 2016 - Part RK-3930
Easy to install. Part of a Stage 1 upgrade along with (Brand Name) pipes and (Brand Name) FuelPak. The combination has made a noticeable change in performance. This is my 4th K&N product and I've been totally satisfied with them all.

Raymond Driscoll Jr
Mechanicsburg, Pennsylvania
Friday, August 26, 2016 - Part RK-3930
Noticeable improvement in performance, easy to install.

Jerry Lohrmeyer
Queen Creek, Arizona
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