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K&N RK-3909 Custom Air Cleaner Assembly 1-5/8' for 1999-2011 Harley Davidson Twin Cam

by K&N Engineering
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Item Description

K&N RK-3909 Custom Air Cleaner Assembly 1-5/8" for 1999-2011 Harley Davidson Twin Cam

The latest addition to K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary K&N High-Flow Air Filter, the new RK Series assembly includes an innovative powder coated billet aluminum backplate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910 comes with a larger air filter and longer spacers than the RK-3909.

NOTE: Excludes Twin Cam engines with Magnetti-Marelli fuel injection system

K&N Part# RK-3909

Bike Fitment:

2007-2010 Harley Davidson FXSTC Softail Custom
2000-2010 Harley Davidson FXSTB Night Train
2008-2010 Harley Davidson FXCW Rocker
2008 Harley Davidson FLSTSB Softail Cross Bones
2000-2007 Harley Davidson FXSTD Softail Deuce
2000-2007 Harley Davidson FXST Softail Standard
1999-2007 Harley Davidson FXDWG Dyna Wide Glide
1999-2007 Harley Davidson FXDL Dyna Low Rider
2005-2007 Harley Davidson FXDC Dyna Super Glide Custom
2007 Harley Davidson FXDB Dyna Street Bob
1999-2007 Harley Davidson FXD Dyna Super Glide
1999-2007 Harley Davidson FLTR Road Glide
2005-2007 Harley Davidson FLSTSC Softail Springer
2006-2007 Harley Davidson FLHX Street Glide
2007 Harley Davidson FLHTCU Ultra Classic Electra Glide
1999-2007 Harley Davidson FLHTC Electra Glide Classic
1999-2007 Harley Davidson FLHT Electra Glide Standard
2004-2007 Harley Davidson FLHRS Road King Custom
2007 Harley Davidson FLHRC Road King Classic
1999-2007 Harley Davidson FLHR Road King
2001-2006 Harley Davidson FXSTS/I Springer Softail
2000-2006 Harley Davidson FXSTS Springer Softail
2001-2006 Harley Davidson FXST/I Softail Standard
2001-2006 Harley Davidson FXSTD/I Softail Deuce
2001-2006 Harley Davidson FXSTB/I Night Train
2004-2006 Harley Davidson FXDWG/I Dyna Wide Glide
2004-2006 Harley Davidson FXDL/I Dyna Low Rider
2006 Harley Davidson Fxdi35 35th ANNIV. Super Glide
2004-2006 Harley Davidson FXD/I Dyna Super Glide
2005-2006 Harley Davidson FXDC/I Dyna Super Glide Custom
2002-2006 Harley Davidson FLTR/I Road Glide
2005-2006 Harley Davidson FLSTSC/I Softail Springer Classic
2005-2006 Harley Davidson FLSTN/I Softail Deluxe
2006 Harley Davidson FLST/I Heritage Softail
2002-2006 Harley Davidson FLSTF/I Fat Boy
2002-2006 Harley Davidson FLSTC/I Heritage Softail Classic
2006 Harley Davidson FLST Heritage Softail
2006 Harley Davidson FLHX/I Street Glide
2003-2006 Harley Davidson FLHT/I Electra Glide Standard
2002-2006 Harley Davidson FLHTCU/I Electra Glide Ultra Classic
2002-2006 Harley Davidson FLHTC/I Electra Glide Classic
2004-2006 Harley Davidson FLHRS/I Road King Custom
2003-2006 Harley Davidson FLHR/I Road King
2002-2006 Harley Davidson FLHRC/I Road King Classic
2004-2005 Harley Davidson FXDX/I Dyna Super Glide Sport
1999-2004 Harley Davidson FXDX Dyna Super Glide Sport
2001-2003 Harley Davidson FXDXT Dyna Super Glide T-Sport
2001-2003 Harley Davidson FLSTS/I Heritage Springer
2000-2003 Harley Davidson FLSTS Heritage Springer
2001 Harley Davidson FXDWG3
2001 Harley Davidson FLSTF/I Fat Boy
2000 Harley Davidson FXDWG2
1999-2000 Harley Davidson FXDS Dyna Convertible

Item Details

  • Developed around an original K&N High-Flow air filter
  • Filter Height: 1-5/8in
  • This complete assembly provides a significant increase in airflow to the engine while boosting performance and filtration
  • Powder-coated aluminum backing plate provides solid mounting surface
  • Dyno-tuned velocity stack optimizes airflow to the engine
  • Internal breathers attach to backing plate requiring no external breathers
  • Laser-etched K&N beauty ring attaches to O.E.M. air cleaner cover maintaining factory appearance
  • Air cleaner cover not included
  • Fits 1999-2010 Twin Cam models
  • NOTE: Excludes Twin Cam engines with Magnetti-Marelli fuel injection system
  • K&N Part# RK-3909

Manufacturers Part Number

RK-3909-1
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