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RK-3951S
$346.99 USD
MSRP $406.99 14.7% Off
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K&N RK-3951S Intake System-Harley Davidson

Custom Assemblies > Intake System-Harley Davidson
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Cast aluminum high-volume, performance air intake housing in silver
  • 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 intake system features a matte silver housing with polished fins. Internal breathers provide a sleek, clean appearance. This air intake has classic styling with a savage appeal.

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

Product Specifications

Estimated Horsepower Gain6.04 HP @ 4907 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 MaterialSilver Powder Coated
Weight4.9 lb (2.2 kg)
Product Box Height5 in (127 mm)
Product Box Length12 in (305 mm)
Product Box Width10 in (254 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-3951S Intake System-Harley Davidson Product Reviews