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RK-3950
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K&N RK-3950 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   4 Customer Reviews
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Cast aluminum high-volume, performance air intake housing in black
  • Washable and reusable K&N High-Flow cotton air filter that provides outstanding performance and protection
  • Integrated internal velocity stack
  • Built-in breathers replace external OE breathers
  • Easy to install, usually in 90 minutes or less
K&N Street Metal Air Intake Systems for Harley Davidson® motorcycles replace the restrictive stock OE air cleaner with an oversized K&N High-Flow Air Filter and a high-volume cast aluminum housing. If you’re looking for an aggressive appearance but want a significant increase in airflow, resulting in more power, this high-flow air intake system is exactly what your Harley needs. Installation is so simple, it can usually be done in 90 minutes or less. The K&N air filter is washable, reusable, pre-oiled and ready for installation. This model features a matte black housing with silver details and sanded fins. Internal breathers provide a sleek, clean appearance. Classic styling with a savage appeal.

[RK Series Street Metal High Flow Air Intakes for Harley-Davidson Motorcycles]

Product Specifications

Estimated Horsepower Gain4.85 HP @ 4851 RPM
Replacement FilterE-3987
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Warranty3 Months
Product StyleMotorcycle Intake System
Air Filter Height2.469 in (63 mm)
CARB EO NumberD-269-59
Street Legal In All US StatesSee Application Link Above
TUV Approved (Europe)No
Overall Height3.25 in (83 mm)
Top MaterialBlack Powder Coated
Weight5 lb (2.2 kg)
Product Box Height4.8 in (122 mm)
Product Box Length12 in (305 mm)
Product Box Width9.5 in (241 mm)
Mounting Hardware IncludedYes
Horsepower gains based on similar vehicle dynamometer test. Results will vary.
WARNING: Cancer and reproductive harm--www.P65warnings.ca.gov

K&N RK-3950 Intake System-Harley Davidson Product Reviews

Wednesday, May 10, 2017 - Part RK-3950
Follow up photo,.

Richard Gergely
Wasaga Beach, Canada
Wednesday, May 10, 2017 - Part RK-3950
Follow up photo.

Richard Gergely
Wasaga Beach, Canada
Wednesday, May 10, 2017 - Part RK-3950
Well done K&N. Super clean filter, beautiful finish. The finned sides along with the wrinkle finish and a nice contrast cut on the intake areas...really nice touch. The Shaker Air Cleaner is an oversized design, definitely maximizing the air intake capacity. I am really happy with this style and brings the bike to a modern standard. The look is unique, simple yet effective. I like the internal breather system keeping things clean. The filter is top quality, but that should be a given. I can easily recommend this air cleaner to others. I did find on my Dyna FXDB, with forward controls, I had to get a slightly larger brake pedal pad to accommodate for the over sized Shaker...but was well worth the little extra effort.

Richard Gergely
Wasaga Beach, Canada