K&N RK-3929

Custom Assemblies > Intake System-Harley Davidson
Your Price: USD $475.06

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K&N's Sportster RK Series Air Cleaner will get more horsepower from your Harley Davidson Sportster motorcycle. This complete assembly fits inside the stock air cleaner cover, and provides a significant increase in airflow.

[More Information on High-Flow Air Intake Systems for Harley-Davidson Motorcycles]
  • Increases power
  • Washable and reusable
  • Provides increased air flow
  • Fits inside stock cover

Product Specifications

Estimated Horsepower Gain4.4 HP @ 5497 RPM
Air Filter ColorRed
Air Filter Height2.25 in (57 mm)
Air Filter Inside Diameter8.063 in (205 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeNot Flanged
Air Filter ShapeOval
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Clamps IncludedNo
Filter MaterialCotton Gauze
Inlet Diameter2.458 in (62 mm)
Mounting Hardware IncludedYes
Neck Flange2.458 in (62 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-3040
Street Legal In All US StatesSee Application Link Above
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

Be the first to review part RK-3929
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