K&N has developed a high flow custom air filter kit product number RK-3931 for 2008 -2009 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
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
Dyno chart for 2008 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:
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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