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RK-3947X
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MSRP $375.00 42.7% Off
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K&N RK-3947X Intake System-Harley Davidson

Custom Assemblies > Intake System-Harley Davidson
  • Designed for Harley-Davidson motorcycles
  • Increase horsepower and torque
  • Extra tall air filter design provides even more air flow and longer service intervals than standard RK-series air intakes
  • Easy to install
  • Made in the U.S.A.
  • Backed by K&N Million Mile Limited Warranty
The K&N RK-3947X Intake System-Harley Davidson fits some Harley Davidson FLHP Road King Police, Harley Davidson FLHR Road King, Harley Davidson FLHRC Road King Classic, Harley Davidson FLHT Electra Glide Standard, Harley Davidson FLHTC Electra Glide Classic, Harley Davidson FLHTCU Electra Glide Ultra Classic, Harley Davidson FLHTCU Ultra Classic Electra Glide, Harley Davidson FLHTCUL Electra Glide Ultra Classic Low, Harley Davidson FLHTCUTG Tri Glide Ultra, Harley Davidson FLHTCUTG Tri Glide Ultra Classic, Harley Davidson FLHTK Electra Glide Ultra Limited, Harley Davidson FLHTK Ultra Limited, Harley Davidson FLHTKL Ultra Limited Low, Harley Davidson FLHTP Electra Glide Police, Harley Davidson FLHX Street Glide, Harley Davidson FLHXS Street Glide Special, Harley Davidson FLHXXX Street Glide Trike, Harley Davidson FLRT Freewheeler, Harley Davidson FLTR Road Glide, Harley Davidson FLTRU Road Glide Ultra, Harley Davidson FLTRX Road Glide, Harley Davidson FLTRX Road Glide Custom, and Harley Davidson FLTRXS Road Glide Special models. See vehicle applications link for details.
K&N’s Street Metal Series High-Flow Air Intake Systems provide a good looking appearance, offer increased airflow and deliver more horsepower & torque to your Harley-Davidson motorcycle. These intake systems increase power by eliminating the stock OE air cleaner which is replaced by a complete high-flow K&N air intake system. This air intake system is constructed with an extra tall K&N air filter providing more air flow and longer service intervals than standard RK-series air intake filters. The extra tall air filter design is intended to be used on larger or custom engine builds that would benefit from higher levels of air flow. Installation is simple with a sturdy, custom aluminum backing plate that mounts directly to the throttle body via an aluminum integrated, internal-run breather system. A durable mounting gasket is also included to help absorb vibration. The K&N high-flow air filter is washable, reusable, pre-oiled and ready for installation. Simple designed custom covers give this air intake good looks while powering down the highway or at your local show.

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

Product Specifications

Estimated Horsepower Gain8.1 HP @ 4.493 RPM
Air Filter ColorRed
Air Filter Height3.125 in (79 mm)
Air Filter MaterialCotton Gauze
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
Overall Height3.125 in (79 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-3986
Street Legal In All US States No
Top MaterialChrome
TUV Approved (Europe)No
Weight4.3 lb (2 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3947X Intake System-Harley Davidson Product Reviews