K&N Street Metal performance air intake systems increase power by replacing the restrictive stock OE air cleaner with a K&N complete performance air intake system.
K&N Street Metal Air Intake Systems for Harley Davidson motorcycles increase power by replacing the restrictive stock OE air cleaner with an oversized K&N High-Flow Air Filter and a cast aluminum high-volume aluminum housing. This K&N high-flow air intake system gives your Harley an aggressive appearance while providing a significant increase in airflow, resulting in more power. Some K&N air intakes are not legal for sale or use in California and other states adopting California emission standards while others are 50 state legal. View the vehicle applications to determine the legal status for each vehicle.
Application Summary:
| Year |
Make/Model |
| 2008-2016 |
Harley Davidson FLHR Road King |
| 2008-2013 |
Harley Davidson FLHRC Road King Classic |
| 2008 |
Harley Davidson FLHRSE4 Screamin Eagle Road King |
| 2008-2009 |
Harley Davidson FLHT Electra Glide Standard |
| 2008-2013 |
Harley Davidson FLHTC Electra Glide Classic |
| 2008-2013 |
Harley Davidson FLHTCU Electra Glide Ultra Classic |
| 2010 |
Harley Davidson FLHTCUSE5 CVO Ultra Classic Electra Glide |
| 2009-2013 |
Harley Davidson FLHTCUTG Tri Glide Ultra Classic |
| 2011-2014 |
Harley Davidson FLHTK Electra Glide Ultra Limited |
| 2015-2016 |
Harley Davidson FLHTK Ultra Limited |
| 2015-2016 |
Harley Davidson FLHTKL Ultra Limited Low |
| 2008-2016 |
Harley Davidson FLHX Street Glide |
| 2014-2016 |
Harley Davidson FLHXS Street Glide Special |
| 2010-2011 |
Harley Davidson FLHXXX Street Glide Trike |
| 2015-2016 |
Harley Davidson FLRT Freewheeler |
| 2016-2017 |
Harley Davidson FLS Softail Slim |
| 2016-2017 |
Harley Davidson FLSS Softail Slim S |
| 2016-2017 |
Harley Davidson FLSTC Heritage Softail Classic |
| 2016-2017 |
Harley Davidson FLSTF Fat Boy |
| 2016 |
Harley Davidson FLSTFB Fat Boy Lo |
| 2016-2017 |
Harley Davidson FLSTFBS Fat Boy S |
| 2016-2017 |
Harley Davidson FLSTN Softail Deluxe |
| 2008-2009 |
Harley Davidson FLTR Road Glide |
| 2011-2013 |
Harley Davidson FLTRU Road Glide Ultra |
| 2015-2016 |
Harley Davidson FLTRX Road Glide |
| 2010-2013 |
Harley Davidson FLTRX Road Glide Custom |
| 2015-2016 |
Harley Davidson FLTRXS Road Glide Special |
| 2016-2017 |
Harley Davidson FXSB Breakout |
| Attributes |
| Air Filter Color |
Red |
| Air Filter Height |
2.469 in (63 mm) |
| Air Filter Included |
Yes |
| Air Filter Material |
Cotton Gauze |
| Air Filter Washable |
Yes |
| Alternate Part Number |
RK-3951 |
| ASIN |
B06W52Z567 |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| California Restricted |
Not legal for sale or use in California |
| CARB EO Number |
D-269-59 |
| Color / Finish |
Red Filter, Black Housing |
| Country of Origin (Primary) |
CN |
| Emission Code |
Legal US |
| Estimated Horsepower Gain |
6.04 HP @ 4907 RPM |
| Harmonized Tariff Code (Schedule B) |
8421310000 |
| Hazardous Material Code |
N |
| Horse Power Increase |
6 HP |
| Housing Material |
Aluminum |
| Item Type |
High Performance |
| Life Cycle Status Code |
Available to Order |
| Mounting Hardware Included |
Yes |
| Overall Height |
3.25 in (83 mm) |
| Package Contents |
1 Air Filter |
| Package Material |
Paperboard |
| Package Quantity |
1 |
| Package Type |
Box |
| Product Box Height |
4.8 in (122 mm) |
| Product Box Length |
12 in (305 mm) |
| Product Box Width |
9.5 in (241 mm) |
| Product Style |
Motorcycle Intake System |
| Replacement Filter |
E-3987 |
| RPM |
4907 |
| SDR Required Flag |
N |
| Street Legal In All US States |
No, Not legal for sale or use in California on any pollution controlled motor vehicle. NOTE: Some specific models and years may be legal in CA. Check the CARB status on your parts at knfilters.com. |
| Top Material |
Black Powder Coated |
| TUV Approved (Europe) |
No, No |
| Warranty |
No-Hassle Lifetime Limited |
| Warranty Time |
3 |
| Weight |
5 lb (2.3 kg) |
| GTIN |
10024844364620 |
