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K&N RK-3942 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   2 Customer Reviews
  • Designed for Harley-Davidson motorcycles
  • Increase horsepower and torque
  • Easy to install
  • Made in USA
  • Backed by K&N warranty
The K&N RK-3942 Intake System-Harley Davidson fits some Harley Davidson FLSTC Heritage Softail Classic, Harley Davidson FLSTF Fat Boy, Harley Davidson FLSTFB Softail Fat Boy Lo, Harley Davidson FLSTN Softail Deluxe, Harley Davidson FXSB Breakout, and Harley Davidson FXSBSE CVO Breakout models. See vehicle applications link for details.
The K&N RK-3942 High-Flow Air Intake System increases engine intake airflow and delivering more horsepower & torque to your Harley-Davidson® motorcycle. The intake system increases power by eliminating the stock OE air cleaner and replacing it with a complete High-Flow Air Intake System. The sturdy, custom aluminum backing plate mounts directly to the throttle body via an aluminum integrated, internal-run breather system. The intake system comes with a K&N Air Filter for high air flow and long service intervals. The K&N High-Flow Air Filter is washable, reusable, pre-oiled and ready for installation.

[More Info on RK Series High-Flow Air Intakes For Harley-Davidson® Motorcycles]

Product Specifications

Estimated Horsepower Gain9.32 HP @ 4803 RPM
Air Filter ColorRed
Air Filter Height2.188 in (56 mm)
Air Filter Inside Diameter6.188 in (157 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
Air Filter ShapeOval
CARB EO NumberD-269-55
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Clamps IncludedNo Clamps Included
Inlet Diameter1.313 in (33 mm)
Mounting Hardware IncludedYes
Neck Flange1.313 in (33 mm)
Overall Height2.188 in (56 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-3980
Size9 Inch
Street Legal In All US StatesYes
Top MaterialBlack Powder Coated
Top StyleMetal
TUV Approved (Europe)No
Weight2.8 lb (1.2 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N RK-3942 Intake System-Harley Davidson Product Reviews

Thursday, May 19, 2016 - Part RK-3942
Just installed yesterday. Along with (Brand Name) Mufflers and (Brand Name) FP3 on 2014 Harley Softail Deluxe. More power and runs significantly cooler.

James Vincent
Friday, October 9, 2015 - Part RK-3942
Excellent product. Great service.

Ridgefield, Connecticut