SHOP FOR YOUR VEHICLE
RK-3937
$341.99 USD
MSRP $596.99 42.7% Off
Free Ground Shipping!
In Stock & Ready to Ship! Find a Dealer

K&N RK-3937 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   3.0 out of 5 stars   1 Customer Review
  • Designed for Harley-Davidson motorcycles
  • Increase horsepower and torque
  • Easy to install
  • Made in USA
  • Backed by K&N warranty
K&N’s Street Metal Series High-Flow Air Intake Systems provide attractive styling, offer increased airflow and deliver more horsepower & torque to your Harley-Davidson motorcycle. These air intake systems eliminate the stock OE air cleaner and replace it with a complete high-flow air intake system to increase power. The sturdy, custom aluminum backing plate mounts directly to the throttle body via an aluminum integrated, internal-run breather system. The air intake system comes with a K&N Air Filter for high air flow and long service intervals. The K&N air filter is washable, reusable, pre-oiled and ready for installation. To help absorb vibration, a durable mounting gasket is also included. A scalloped teardrop-shaped custom cover gives this air intake the type of edge you’d only expect to see on full-custom choppers.

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

Product Specifications

Estimated Horsepower Gain10.67 HP @ 4882 RPM
Replacement FilterE-3333
Air Filter ColorRed
Air Filter MaterialCotton Gauze
Warranty12 Months
Product StyleMotorcycle Intake System
Air Filter Height2.188 in (56 mm)
CARB EO NumberD-269-55/59
Street Legal In All US StatesSee Application Link Above
TUV Approved (Europe)No
Inlet Diameter2.25 in (57 mm)
Overall Height4.75 in (121 mm)
Top MaterialChrome
Weight4.8 lb (2.2 kg)
Product Box Height4.88 in (124 mm)
Product Box Length11.75 in (298 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-3937 Intake System-Harley Davidson Product Reviews

Monday, March 20, 2017 - Part RK-3937
I have used many K&N products over the years, and have always been completely satisfied. This is a nice product that was easy to install, and included all necessary parts. The bike does breathe a lot easier now. I do however have two complaints with this item, which was cause for only a 3 star rating. 1) The parts could have been packed a little better in the box, as the chrome front plate was scuffed in shipping. 2) The kit says Made In The USA on the box. (one of my reasons for buying K&N). The two breather bolts in the kit were in separate plastic bags with a made in Taiwan sticker on them. One of the bolts had poor threads, and required a little work in the garage, prior to assembly. I still recommend K&N products, and would buy again if needed.

Joesph Hamilton
Cedar Lake, Indiana