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K&N RK-3930X Intake System-Harley Davidson

Custom Assemblies > Intake System-Harley Davidson
  • Increases horsepower
  • Washable and reusable
  • Fits inside stock cover
  • Provides increased air flow
The K&N RK-3930X 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 FLHRSE4 Screamin Eagle Road King, 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 FLHTCUSE5 CVO Ultra Classic Electra Glide, Harley Davidson FLHTCUTG Tri Glide Ultra Classic, Harley Davidson FLHTK Electra Glide Ultra Limited, Harley Davidson FLHTP Electra Glide Police, Harley Davidson FLHX Street Glide, Harley Davidson FLHXXX Street Glide Trike, Harley Davidson FLTR Road Glide, Harley Davidson FLTRU Road Glide Ultra, and Harley Davidson FLTRX Road Glide Custom models. See vehicle applications link for details.
The K&N RK-3930X Air Intake System was designed to get more horsepower from your Twin Cam Harley-Davidson engine. By utilizing the stock air cleaner cover, the factory look is retained. Built around the legendary K&N High-Flow Air Filter, this RK Series assembly includes an innovative powder coated billet aluminum back plate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. The RK-39130X comes with a larger air filter and longer spacers than the RK-3930.

[More Information on High-Flow Air Intake Systems for Harley-Davidson Motorcycles]

Product Specifications

Estimated Horsepower Gain5.91 HP @ 4399 RPM
Replacement FilterE-3985
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Product StyleMotorcycle Intake System
Air Filter Height1.625 in (41 mm)
Street Legal In All US States No
TUV Approved (Europe)No
Overall Height1.875 in (48 mm)
Top MaterialAluminum
Package Contents1 Air Filter
Package Quantity1
Weight3.5 lb (1.6 kg)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 mm)
Product Box Width9.5 in (241 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3930X Intake System-Harley Davidson Product Reviews