Add 6.5 More Horsepower to Harley Davidson Dyna Models with K&N Custom Intake Assembly

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K&N has developed a high flow custom air filter kit product number RK-3931 for 2008, 2009 and 2010 Harley Davidson Dyna FXD motorcycles. The oversized custom air intake assembly was developed around an original K&N high flow air filter and will fit neatly behind your Harley’s air filter cover. The K&N air filter is washable, reusable, pre-oiled and ready to ride. See the complete list of motorcycles below.

K&N high flow complete air cleaner assembly RK-3931 for Harley Davidson Dyna FXD model motorcycles
K&N high flow complete air cleaner assembly RK-3931 for Harley Davidson Dyna FXD model motorcycles

The RK-3931 is designed to get more horsepower from your Harley-Davidson engine, in fact K&N dyno testing shows a 6.54 horsepower increase @ 5100 RPM on a 2008 Harley Davidson Dyna Street Bob.
Harley Davidson Dyna Wide
Harley Davidson Dyna Wide

Dyno chart for Harley Davidson Street Bob
Dyno chart for Harley Davidson Street Bob

The cast aluminum back plate includes built-in internal breathers. Also, a bolted-in dyno tuned velocity stack decreases the restriction of air into the throttle body. The result is more power you can feel with outstanding engine protection.

Spacers and hardware are included to mount your stock Harley Davidson air cleaner cover and a bump-seal is used at the base to provide a perfect seal. Installation can be performed in 90 minutes or less.

The RK-3931 is covered by the famous K&N Million Mile Limited Warranty.

Motorcycle applications are as follows:

2012 HARLEY DAVIDSON FXDWG DYNA WIDE GLIDE 103 CI
2012 HARLEY DAVIDSON FXDF FAT BOB 103 CI
2012 HARLEY DAVIDSON FXDC DYNA SUPER GLIDE CUSTOM 96 CI
2012 HARLEY DAVIDSON FXDB DYNA STREET BOB 96 CI
2012 HARLEY DAVIDSON FLD DYNA SWITCHBACK 103 CI
2011 HARLEY DAVIDSON FXDWG DYNA WIDE GLIDE 96 CI
2011 HARLEY DAVIDSON FXDF FAT BOB 96 CI
2011 HARLEY DAVIDSON FXDC DYNA SUPER GLIDE CUSTOM 96 CI
2011 HARLEY DAVIDSON FXDB DYNA STREET BOB 96 CI
2010 HARLEY DAVIDSON FXDWG DYNA WIDE GLIDE 1586
2010 HARLEY DAVIDSON FXDL DYNA LOW RIDER 1586
2010 HARLEY DAVIDSON FXDF FAT BOB 1586
2010 HARLEY DAVIDSON FXDC DYNA SUPER GLIDE CUSTOM 1586
2010 HARLEY DAVIDSON FXDB DYNA STREET BOB 1586
2010 HARLEY DAVIDSON FXD DYNA SUPER GLIDE 1586 - All 2009 HARLEY DAVIDSON FXDL DYNA LOW RIDER 1584
2009 HARLEY DAVIDSON FXDF FAT BOB 1584
2009 HARLEY DAVIDSON FXDC DYNA SUPER GLIDE CUSTOM 1584
2009 HARLEY DAVIDSON FXDB DYNA STREET BOB 1584
2009 HARLEY DAVIDSON FXD DYNA SUPER GLIDE 1584
2008 HARLEY DAVIDSON FXDWG DYNA WIDE GLIDE 1584
2008 HARLEY DAVIDSON FXDL DYNA LOW RIDER 1584
2008 HARLEY DAVIDSON FXDF FAT BOB 1584
2008 HARLEY DAVIDSON FXDC DYNA SUPER GLIDE CUSTOM 1584
2008 HARLEY DAVIDSON FXDB DYNA STREET BOB 1584
2008 HARLEY DAVIDSON FXD DYNA SUPER GLIDE 1584

Find K&N products for your vehicle using the K&N application search then use the K&N dealer search to find a K&N dealer in your part of the world.



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K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports from off-road and powersports to drag racing, stock cars and road racing. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail tech@knfilters.com, or visit www.knfilters.com.

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