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     13 Customer Reviews
$178.99 USD
In Stock & Ready to Ship!   Free Ground Shipping!
Find a Dealer

Product Overview

  • 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]
Estimated Horsepower Gain8.43 HP @ 3700 RPM
Replacement FilterE-3972
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Warranty1,000,000 Miles/10 Year
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-269-55/59
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.
WARNING: Cancer and reproductive

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

Saturday, September 8, 2018 - Part RK-3930
The intake system arrived when expected and added to the performance of my motorcycle greatly. It was a very easy install and allowed me to keep the original cover. Exactly what I was looking for.

James Johnson
Kosciusko, Mississippi
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