K&N RK-3931

Custom Assemblies > Intake System-Harley Davidson
Your Price: USD $261.39

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K&N Air Cleaner Assemblies are designed to get more horsepower from your Harley-Davidson® motorcycle. These air cleaner assemblies replace the stock air filter and backplate with an oversized K&N Air Filter and custom aluminum backing plate. These assemblies utilizes the stock cover to maintain stock appearance.

[More Information on High-Flow Air Intake Systems for Harley-Davidson Motorcycles]
  • Designed to increase horsepower & torque
  • Dyno-tuned velocity stack
  • Excellent Air Filtration
  • Washable and reusable lifetime air filter
  • Not legal for highway use in states adopting California emission regulations

Product Specifications

Estimated Horsepower Gain6.54 HP @ 5100 RPM
Air Filter ColorRed
Air Filter Height2.125 in (54 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeNot Flanged
Air Filter ShapeUnique
California RestrictedNot legal for sale or use in California
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Clamps IncludedNo
Filter MaterialCotton Gauze
Inlet Diameter2.406 in (61 mm)
Mounting Hardware IncludedYes
Neck Flange2.406 in (61 mm)
Overall Height2.5 in (64 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-3975
Size9 Inch
Street Legal In All US States No
Top Material/FinishAluminum
Top StyleMetal
Total Height2.5 in (64 mm)
TUV Approved (Europe)No
Weight3.1 lb (1.4 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Customer Feedback

This filter designed spared me the trouble of using the Harley Davidson stock replacement kit or the expensive naked filter assembly. I have hi-flow performance concealed in the original housing. My bike is a very new production model with limited after market products available, so Thanks K&N. Harley Davidson Street 750 owner.

Brother Andy
Awesome air filter. Added more horse power to my Harley Davidson

Best filters ever. Run them in all my vehicles including my Harley Davidson Motorcycle. Saved a ton of $$$ too by not having to purchase replacement paper filters every time.

Bill Sleeper
Altadena, California