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K&N RK-3909 Custom 1-5/8in. Air Cleaner Assembly for Harley Davidson 1999-2013 Twin Cam (exc. 1999-2001 FI FLT, 2008-13 FLH, FLT)

by K&N
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Item Description

K&N RK-3909 Custom 1-5/8in. Air Cleaner Assembly for Harley Davidson 1999-2013 Twin Cam (exc. 1999-2001 FI FLT, 2008-13 FLH, FLT)

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.

Bike Fitments
1999-2007 Harley Davidson FLHR Road King
2007 Harley Davidson FLHRC Road King Classic
2001-2006 Harley Davidson FLHRCI Road King Classic
2005-2006 Harley Davidson FLHRI Road King
2004-2007 Harley Davidson FLHRS Road King Custom
2004-2006 Harley Davidson FLHRSI Road King Custom
1999-2007 Harley Davidson FLHT Electra Glide Standard
1999-2007 Harley Davidson FLHTC Electra Glide Classic
2002-2006 Harley Davidson FLHTCI Electra Glide Classic
2007 Harley Davidson FLHTCU Electra Glide Ultra Classic
2002-2006 Harley Davidson FLHTCUI Electra Glide Ultra Classic
2003-2006 Harley Davidson FLHTI Electra Glide Standard
2006-2007 Harley Davidson FLHX Street Glide
2006 Harley Davidson FLHXI Street Glide
2012-2014 Harley Davidson FLS Softail Slim
2006 Harley Davidson FLST Heritage Softail
2000-2014 Harley Davidson FLSTC Heritage Softail Classic
2002-2006 Harley Davidson FLSTCI Heritage Softail Classic
2000-2014 Harley Davidson FLSTF Fat Boy
2010-2014 Harley Davidson FLSTFB Fat Boy Lo
2001-2006 Harley Davidson FLSTFI Fat Boy
2006 Harley Davidson FLSTI Heritage Softail
2005-2014 Harley Davidson FLSTN Softail Deluxe
2005-2006 Harley Davidson FLSTNI Softail Deluxe
2000-2003 Harley Davidson FLSTS Heritage Springer
2008-2011 Harley Davidson FLSTSB Cross Bones
2005-2007 Harley Davidson FLSTSC Softail Springer Classic
2005-2006 Harley Davidson FLSTSCI Softail Springer Classic
2001-2003 Harley Davidson FLSTSI Heritage Springer
1999-2007 Harley Davidson FLTR Road Glide
2002-2006 Harley Davidson FLTRI Road Glide
2011 Harley Davidson FLTRX Road Glide Custom
2008-2009 Harley Davidson FXCW Rocker
2008-2011 Harley Davidson FXCWC Rocker C
1999-2007 Harley Davidson FXD Dyna Super Glide
2007 Harley Davidson FXDB Street Bob
2006 Harley Davidson FXDBI Street Bob
2005-2007 Harley Davidson FXDC Super Glide Custom
2005-2006 Harley Davidson FXDCI Super Glide Custom
2004-2006 Harley Davidson FXDI Dyna Super Glide
2006 Harley Davidson FXDI35 Dyna 35th Anniversary Super Glide
1999-2007 Harley Davidson FXDL Dyna Low Rider
2004-2006 Harley Davidson FXDLI Dyna Low Rider
1999-2000 Harley Davidson FXDS-Conv Dyna Convertible
1999-2007 Harley Davidson FXDWG Dyna Wide Glide
2004-2006 Harley Davidson FXDWGI Dyna Wide Glide
1999-2004 Harley Davidson FXDX Dyna Super Glide Sport
2004-2005 Harley Davidson FXDXI Dyna Super Glide Sport
2001-2003 Harley Davidson FXDXT Dyna Super Glide T-Sport
2011-2013 Harley Davidson FXS Blackline
2013-2014 Harley Davidson FXSB Breakout
2000-2007 Harley Davidson FXST Softail Standard
2000-2009 Harley Davidson FXSTB Night Train
2001-2006 Harley Davidson FXSTBI Night Train
2007-2010 Harley Davidson FXSTC Softail Custom
2000-2007 Harley Davidson FXSTD Softail Deuce
2001-2006 Harley Davidson FXSTDI Softail Deuce
2001-2006 Harley Davidson FXSTI Softail Standard
2000-2006 Harley Davidson FXSTS Springer Softail
2001-2006 Harley Davidson FXSTSI Springer Softail

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
  • NOTE: Excludes Twin Cam engines with Magnetti-Marelli fuel injection system
  • Street Legal in Most States
  • Not Legal for Use in CA and Other States Adopting CA Emissions Standards

Manufacturers Part Number

RK-3909-1
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