Get Bolt-On Power for your 2008-2015 Harley® FL with a High Flow Air Intake System

The K&N RK-3946X product view for the Harley FL

The K&N RK-3946X is a complete replacement intake system for your Harley FL

The iconic Harley-Davidson® "Silent Gray Fellow," with its 30 CI engine, put out 6.5 peak horsepower in 1912. The riders of that turn-of-the-century single would be amazed that a bolt-on air intake could add more horsepower to a Harley than their ride put out in total.

Well, that’s just what the K&N RK-3946X Street Metal high-flow air intake system can do for your Harley-Davidson FL model. K&N’s dynamometer testing revealed an estimated horsepower gain of over 7.5 horsepower when the RK-3946X was installed on a stock 2015 103 CI Harley-Davidson Street Glide.

That same Street Glide showed an estimated increase in torque of almost 9 foot-pounds at approximately 2800 RPM with the RK-3946X intake. Of course, your performance gains will vary by model, bike set-up, and condition. However, you can expect a noticeable bump in acceleration and power with the RK-3946X intake.

The RK-3946X is designed as a complete replacement for the stock Harley intake and filter. The intake mounts directly to the throttle body with an integrated aluminum internal-run breather system incorporated in a custom aluminum backing plate.

The K&N RK-3946X parts view for the Harley FL

Everything that is needed for easy installation is included in the RK-3946X kit

The entire intake adds a clean, custom look to your Harley. The exposed K&N filter element is capped off with an attractive chrome intake cover that compliments the engine perfectly.

The “X” in the RK-3946X indicates that the intake features an extra tall air filter design that provides even more air flow and longer service intervals than standard RK-series air intakes. It is a perfect addition to large engine builds or for bikes that have other modifications like a supercharger or tune that will benefit from the significant increase in airflow.

K&N’s legendary cotton gauze filter material ensures that only clean, filtered air makes it to the big jugs on your V-twin. The pleated element is fully washable and reusable and comes with K&N’s 10-Year/Million Mile Limited Warranty. It is pre-oiled and ready to install directly out of the box.

Take a look at the extensive application list below, and consult K&N’s online application search tool for all of your Harley filtration needs.

The K&N RK-3946X mounted on a Harley FL

The RK-3946X compliments the look of the Harley V-twin

2015 HARLEY DAVIDSON FLTRXS ROAD GLIDE SPECIAL 103 CI - All Models
2015 HARLEY DAVIDSON FLTRX ROAD GLIDE 103 CI - All Models
2015 HARLEY DAVIDSON FLRT FREEWHEELER 103 CI - All Models
2015 HARLEY DAVIDSON FLHXS STREET GLIDE SPECIAL 103 CI - All Models
2015 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI - All Models
2015 HARLEY DAVIDSON FLHTKL ULTRA LIMITED LOW 103 CI - All Models
2015 HARLEY DAVIDSON FLHTK ULTRA LIMITED 103 CI - All Models
2015 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA 103 CI - All Models
2015 HARLEY DAVIDSON FLHTCUL ELECTRA GLIDE ULTRA CLASSIC LOW 103 CI - All Models
2015 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI - All Models
2015 HARLEY DAVIDSON FLHR ROAD KING 103 CI - All Models
2014 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI - All Models
2014 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI - All Models
2014 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA 103 CI - All Models
2014 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI - All Models
2014 HARLEY DAVIDSON FLHR ROAD KING 103 CI - All Models
2013 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 103 CI - All Models
2013 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI - All Models
2013 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI - All Models
2013 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI - All Models
2013 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI - All Models
2013 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 103 CI - All Models
2013 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 103 CI - All Models
2013 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI - All Models
2013 HARLEY DAVIDSON FLHR ROAD KING 103 CI - All Models
2012 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 103 CI - All Models
2012 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI - All Models
2012 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI - All Models
2012 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI - All Models
2012 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI - All Models
2012 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI - All Models
2012 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 103 CI - All Models
2012 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI - All Models
2012 HARLEY DAVIDSON FLHR ROAD KING 103 CI - All Models
2011 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI - All Models
2011 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI - All Models
2011 HARLEY DAVIDSON FLHXXX STREET GLIDE TRIKE 103 CI - All Models
2011 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI - All Models
2011 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI - All Models
2011 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI - All Models
2011 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI - All Models
2011 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI - All Models
2011 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI - All Models
2011 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI - All Models
2011 HARLEY DAVIDSON FLHR ROAD KING 96 CI - All Models
2011 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI - All Models
2010 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI - All Models
2010 HARLEY DAVIDSON FLHXXX STREET GLIDE TRIKE 103 CI - All Models
2010 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI - All Models
2010 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI - All Models
2010 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI - All Models
2010 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI - All Models
2010 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI - All Models
2010 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI - All Models
2010 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI - All Models
2010 HARLEY DAVIDSON FLHR ROAD KING 96 CI - All Models
2010 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI - All Models
2009 HARLEY DAVIDSON FLTR ROAD GLIDE 96 CI - All Models
2009 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI - All Models
2009 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI - All Models
2009 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI - All Models
2009 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI - All Models
2009 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI - All Models
2009 HARLEY DAVIDSON FLHT ELECTRA GLIDE STANDARD 96 CI - All Models
2009 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI - All Models
2009 HARLEY DAVIDSON FLHR ROAD KING 96 CI - All Models
2009 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI - All Models
2008 HARLEY DAVIDSON FLTR ROAD GLIDE 96 CI - All Models
2008 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI - All Models
2008 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI - All Models
2008 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI - All Models
2008 HARLEY DAVIDSON FLHT ELECTRA GLIDE STANDARD 96 CI - All Models
2008 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI - All Models
2008 HARLEY DAVIDSON FLHR ROAD KING 96 CI - All Models

clear

K&N PRODUCT SEARCH     WHERE TO BUY K&N