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K&N RK-3956 Intake System-Harley Davidson

Custom Assemblies / Intake System-Harley Davidson
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RK-3956
$233.99 USD
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Product Overview

  • 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
The K&N RK-3956 Intake System-Harley Davidson fits some Harley Davidson FLDE Deluxe, Harley Davidson FLFB Fat Boy, Harley Davidson FLFBS Fat Boy, Harley Davidson FLHC Heritage Classic, Harley Davidson FLHCS Heritage Classic, Harley Davidson FLHR Road King, Harley Davidson FLHRXS Road King Special, Harley Davidson FLHTCU Electra Glide Ultra Classic, Harley Davidson FLHTCUTG Tri Glide Ultra, Harley Davidson FLHTK Ultra Limited, Harley Davidson FLHTKL Ultra Limited Low, Harley Davidson FLHX Street Glide, Harley Davidson FLHXS Street Glide Special, Harley Davidson FLRT Freewheeler, Harley Davidson FLSB Sport Glide, Harley Davidson FLSL Softail Slim, Harley Davidson FLTRU Road Glide Ultra, Harley Davidson FLTRX Road Glide, Harley Davidson FLTRXS Road Glide Special, Harley Davidson FXBB Street Bob, Harley Davidson FXBR Breakout, Harley Davidson FXBRS Breakout, Harley Davidson FXFB Fat Bob, Harley Davidson FXFBS Fat Bob, Harley Davidson FXLR Low Rider, and Harley Davidson FXLR Low Rider Custom models. See vehicle applications link for details.
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 intake system features an updated, modern look with an oval-shaped matte black housing. Silver details and sanded fins further enhance the streamlined look. Internal breathers provide a sleek, clean appearance. This air intake has a classic styling with a savage appeal. These K&N air intakes are street legal in most states. They are not legal for use in California and other states adopting California emission standards.

[RK Series Street Metal High Flow Air Intakes for Harley-Davidson Motorcycles]
Estimated Horsepower Gain5.19 HP @ 4981 RPM
Replacement FilterE-3988
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Warranty1,000,000 Miles/10 Year
Product StyleMotorcycle Intake System
Air Filter Height2.406 in (61 mm)
CARB EO NumberD-269-60
Street Legal In All US StatesSee Application Link Above
TUV Approved (Europe)No
Overall Height4.25 in (108 mm)
Top MaterialBlack Powder Coated
Package Contents1 Air Filter
Package Quantity1
Weight4.3 lb (1.9 kg)
Product Box Height4.88 in (124 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-3956 Intake System-Harley Davidson Product Reviews

Tuesday, October 9, 2018 - Part RK-3956
Easy installation for a good fit and very noticeable throttle response for my 2018 HD Sport Glide. The unit sticks out from the bike a little further than stock air cleaner but no hindrance what so ever.

Robert Todd McLean
Holly Ridge, North Carolina
Saturday, July 28, 2018 - Part RK-3956
Easy to install. Looks great. Love the performance and sound with the addition of the Vance and Hines Slip-On’s.

Travis Martin
Elmhurst Township, Pennsylvania
Tuesday, July 24, 2018 - Part RK-3956
Great price and fit.

Thomas Roche
Murrieta, California