K&N's Street Metal Series High-Flow Air Intake Systems offer increased airflow and deliver more horsepower & torque to your Harley-Davidson motorcycle.
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.
- Designed for Harley-Davidson motorcycles
- Increase horsepower and torque
- Easy to install
- Made in USA
- Backed by K&N warranty
Application Summary:
| Year |
Make/Model |
| 2013-2015 |
Harley-Davidson FLSTC Heritage Softail Classic |
| 2013-2015 |
Harley-Davidson FLSTF Fat Boy |
| 2013-2015 |
Harley-Davidson FLSTFB Fat Boy Lo |
| 2013-2015 |
Harley-Davidson FLSTN Softail Deluxe |
| 2013-2015 |
Harley-Davidson FXSB Breakout |
| 2013-2014 |
Harley-Davidson FXSBSE CVO Breakout |
| Attributes |
| Air Filter Color |
Red |
| Air Filter Height |
2.188 in (56 mm) |
| Air Filter Inside Diameter |
6.188 in (157 mm) |
| Air Filter Material |
Cotton Gauze |
| Air Filter Outlet Shape |
Round |
| Air Filter Shape |
Oval |
| Air Filter Washable |
Yes |
| Alternate Part Number |
RK-3942 |
| ASIN |
B011RKYY08 |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| CARB EO Number |
D-269-55 |
| Clamp Material |
No Clamps Required |
| Clamp Style |
No Clamps Required |
| Clamps Included |
No Clamps Included |
| Color / Finish |
Red Filter, Metal Top |
| Country of Origin (Primary) |
US |
| Emission Code |
Legal US |
| Estimated Horsepower Gain |
9.32 HP @ 4803 RPM |
| Harmonized Tariff Code (Schedule B) |
8421310000 |
| Hazardous Material Code |
N |
| Horse Power Increase |
9 HP |
| Inlet Diameter |
1.313 in (33 mm) |
| Life Cycle Status Code |
Available to Order |
| Mounting Hardware Included |
Yes |
| NAFTA Preference Criterion Code |
B |
| Neck Flange |
1.313 in (33 mm) |
| Overall Height |
2.188 in (56 mm) |
| Package Material |
Paperboard |
| Package Type |
Box |
| Product Box Height |
4.88 in (124 mm) |
| Product Box Length |
11.75 in (298 mm) |
| Product Box Width |
9.5 in (241 mm) |
| Product Style |
Motorcycle Intake System |
| Replacement Filter |
E-3980 |
| RPM |
4803 |
| SDR Required Flag |
N |
| Size |
9 Inch |
| Street Legal In All US States |
Yes, Legal for use in all 50 states. |
| Style |
Oval |
| Top Material |
Black Powder Coated |
| Top Style |
Metal |
| TUV Approved (Europe) |
No, No |
| Warranty |
No-Hassle Lifetime Limited |
| Weight |
2.8 lb (1.2 kg) |
| GTIN |
00024844359780 |
