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 this 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-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1.
The latest addition to K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Provides a significant airflow increase to the engine without sacrificing filtration.
Fits
Harley Davidson FLHR Road King Base 1999
Harley Davidson FLHR Road King Base 2000
Harley Davidson FLHR Road King Base 2001
Harley Davidson FLHR Road King Base 2002
Harley Davidson FLHR Road King Base 2003
Harley Davidson FLHR Road King Base 2004
Harley Davidson FLHR Road King Base 2005
Harley Davidson FLHR Road King Base 2006
Harley Davidson FLHR Road King Base 2007
Harley Davidson FLHRC Road King Classic Base 2007
Harley Davidson FLHRCI Road King Classic Base 2002
Harley Davidson FLHRCI Road King Classic Base 2003
Harley Davidson FLHRCI Road King Classic Base 2004
Harley Davidson FLHRCI Road King Classic Base 2005
Harley Davidson FLHRCI Road King Classic Base 2006
Harley Davidson FLHRI Road King Base 2003
Harley Davidson FLHRI Road King Base 2004
Harley Davidson FLHRI Road King Base 2005
Harley Davidson FLHRI Road King Base 2006
Harley Davidson FLHRS Road King Custom Base 2004
Harley Davidson FLHRS Road King Custom Base 2005
Harley Davidson FLHRS Road King Custom Base 2006
Harley Davidson FLHRS Road King Custom Base 2007
Harley Davidson FLHRSI Road King Custom Base 2004
Harley Davidson FLHRSI Road King Custom Base 2005
Harley Davidson FLHRSI Road King Custom Base 2006
Harley Davidson FLHT Electra Glide Standard Base 1999
Harley Davidson FLHT Electra Glide Standard Base 2000
Harley Davidson FLHT Electra Glide Standard Base 2001
Harley Davidson FLHT Electra Glide Standard Base 2002
Harley Davidson FLHT Electra Glide Standard Base 2003
Harley Davidson FLHT Electra Glide Standard Base 2004
Harley Davidson FLHT Electra Glide Standard Base 2005
Harley Davidson FLHT Electra Glide Standard Base 2006
Harley Davidson FLHT Electra Glide Standard Base 2007
Harley Davidson FLHTC Electra Glide Classic Base 1999
Harley Davidson FLHTC Electra Glide Classic Base 2000
Harley Davidson FLHTC Electra Glide Classic Base 2001
Harley Davidson FLHTC Electra Glide Classic Base 2002
Harley Davidson FLHTC Electra Glide Classic Base 2003
Harley Davidson FLHTC Electra Glide Classic Base 2004
Harley Davidson FLHTC Electra Glide Classic Base 2005
Harley Davidson FLHTC Electra Glide Classic Base 2007
Harley Davidson FLHTCI Electra Glide Classic Base 2002
Harley Davidson FLHTCI Electra Glide Classic Base 2003
Harley Davidson FLHTCI Electra Glide Classic Base 2004
Harley Davidson FLHTCI Electra Glide Classic Base 2005
Harley Davidson FLHTCI Electra Glide Classic Base 2006
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2007
Harley Davidson FLHTCUI Electra Glide Ultra Classic Base 2002
Harley Davidson FLHTCUI Electra Glide Ultra Classic Base 2003
Harley Davidson FLHTCUI Electra Glide Ultra Classic Base 2004
Harley Davidson FLHTCUI Electra Glide Ultra Classic Base 2005
Harley Davidson FLHTCUI Electra Glide Ultra Classic Base 2006
Harley Davidson FLHTI Electra Glide Standard Base 2003
Harley Davidson FLHTI Electra Glide Standard Base 2004
Harley Davidson FLHTI Electra Glide Standard Base 2005
Harley Davidson FLHTI Electra Glide Standard Base 2006
Harley Davidson FLHX Street Glide Base 2006
Harley Davidson FLHX Street Glide Base 2007
Harley Davidson FLHXI Street Glide Base 2006
Harley Davidson FLST Heritage Softail Base 2006
Harley Davidson FLSTC Heritage Softail Classic Base 2000
Harley Davidson FLSTC Heritage Softail Classic Base 2001
Harley Davidson FLSTC Heritage Softail Classic Base 2002
Harley Davidson FLSTC Heritage Softail Classic Base 2003
Harley Davidson FLSTC Heritage Softail Classic Base 2004
Harley Davidson FLSTC Heritage Softail Classic Base 2005
Harley Davidson FLSTC Heritage Softail Classic Base 2006
Harley Davidson FLSTC Heritage Softail Classic Base 2007
Harley Davidson FLSTC Heritage Softail Classic Base 2008
Harley Davidson FLSTC Heritage Softail Classic Base 2009
Harley Davidson FLSTC Heritage Softail Classic Base 2010
Harley Davidson FLSTC Heritage Softail Classic Base 2011
Harley Davidson FLSTC Heritage Softail Classic Base 2012
Harley Davidson FLSTCI Heritage Softail Classic Base 2002
Harley Davidson FLSTCI Heritage Softail Classic Base 2003
Harley Davidson FLSTCI Heritage Softail Classic Base 2004
Harley Davidson FLSTCI Heritage Softail Classic Base 2005
Harley Davidson FLSTCI Heritage Softail Classic Base 2006
Harley Davidson FLSTF Fat Boy Base 2000
Harley Davidson FLSTF Fat Boy Base 2001
Harley Davidson FLSTF Fat Boy Base 2002
Harley Davidson FLSTF Fat Boy Base 2003
Harley Davidson FLSTF Fat Boy Base 2004
Harley Davidson FLSTF Fat Boy Base 2005
Harley Davidson FLSTF Fat Boy Base 2006
Harley Davidson FLSTF Fat Boy Base 2007
Harley Davidson FLSTF Fat Boy Base 2008
Harley Davidson FLSTF Fat Boy Base 2009
Harley Davidson FLSTF Fat Boy Base 2010
Harley Davidson FLSTF Fat Boy Base 2011
Harley Davidson FLSTF Fat Boy Base 2012
Harley Davidson FLSTFB Fat Boy Lo Base 2010
Harley Davidson FLSTFB Fat Boy Lo Base 2011
Harley Davidson FLSTFB Fat Boy Lo Base 2012
Harley Davidson FLSTFI Fat Boy Base 2001
Harley Davidson FLSTFI Fat Boy Base 2002
Harley Davidson FLSTFI Fat Boy Base 2003
Harley Davidson FLSTFI Fat Boy Base 2004
Harley Davidson FLSTFI Fat Boy Base 2005
Harley Davidson FLSTFI Fat Boy Base 2006
Harley Davidson FLSTI Heritage Softail Base 2006
Harley Davidson FLSTN Softail Deluxe Base 2005
Harley Davidson FLSTN Softail Deluxe Base 2006
Harley Davidson FLSTN Softail Deluxe Base 2007
Harley Davidson FLSTN Softail Deluxe Base 2008
Harley Davidson FLSTN Softail Deluxe Base 2009
Harley Davidson FLSTN Softail Deluxe Base 2010
Harley Davidson FLSTN Softail Deluxe Base 2011
Harley Davidson FLSTN Softail Deluxe Base 2012
Harley Davidson FLSTNI Softail Deluxe Base 2005
Harley Davidson FLSTNI Softail Deluxe Base 2006
Harley Davidson FLSTS Heritage Springer Base 2000
Harley Davidson FLSTS Heritage Springer Base 2001
Harley Davidson FLSTS Heritage Springer Base 2002
Harley Davidson FLSTS Heritage Springer Base 2003
Harley Davidson FLSTSC Softail Springer Classic Base 2005
Harley Davidson FLSTSC Softail Springer Classic Base 2006
Harley Davidson FLSTSC Softail Springer Classic Base 2007
Harley Davidson FLSTSCI Softail Springer Classic Base 2005
Harley Davidson FLSTSCI Softail Springer Classic Base 2006
Harley Davidson FLSTSI Heritage Springer Base 2001
Harley Davidson FLSTSI Heritage Springer Base 2002
Harley Davidson FLSTSI Heritage Springer Base 2003
Harley Davidson FLTR Road Glide Base 1999
Harley Davidson FLTR Road Glide Base 2000
Harley Davidson FLTR Road Glide Base 2001
Harley Davidson FLTR Road Glide Base 2002
Harley Davidson FLTR Road Glide Base 2007
Harley Davidson FLTRI Road Glide Base 2002
Harley Davidson FLTRI Road Glide Base 2003
Harley Davidson FLTRI Road Glide Base 2004
Harley Davidson FLTRI Road Glide Base 2005
Harley Davidson FLTRI Road Glide Base 2006
Harley Davidson FLTRX Road Glide Custom Base 2010
Harley Davidson FLTRX Road Glide Custom Base 2011
Harley Davidson FXCW Rocker Base 2008
Harley Davidson FXCW Rocker Base 2009
Harley Davidson FXCWC Rocker C Base 2008
Harley Davidson FXCWC Rocker C Base 2009
Harley Davidson FXCWC Rocker C Base 2010
Harley Davidson FXCWC Rocker C Base 2011
Harley Davidson FXD Dyna Super Glide Base 1999
Harley Davidson FXD Dyna Super Glide Base 2000
Harley Davidson FXD Dyna Super Glide Base 2001
Harley Davidson FXD Dyna Super Glide Base 2002
Harley Davidson FXD Dyna Super Glide Base 2003
Harley Davidson FXD Dyna Super Glide Base 2004
Harley Davidson FXD Dyna Super Glide Base 2005
Harley Davidson FXD Dyna Super Glide Base 2006
Harley Davidson FXD Dyna Super Glide Base 2007
Harley Davidson FXDB Street Bob Base 2007
Harley Davidson FXDBI Street Bob Base 2006
Harley Davidson FXDC Super Glide Custom Base 2005
Harley Davidson FXDC Super Glide Custom Base 2007
Harley Davidson FXDCI Super Glide Custom Base 2005
Harley Davidson FXDCI Super Glide Custom Base 2006
Harley Davidson FXDI Dyna Super Glide Base 2004
Harley Davidson FXDI Dyna Super Glide Base 2005
Harley Davidson FXDI Dyna Super Glide Base 2006
Harley Davidson FXDI35 Dyna 35th Anniversary Super Glide Base 2006
Harley Davidson FXDL Dyna Low Rider Base 1999
Harley Davidson FXDL Dyna Low Rider Base 2000
Harley Davidson FXDL Dyna Low Rider Base 2001
Harley Davidson FXDL Dyna Low Rider Base 2002
Harley Davidson FXDL Dyna Low Rider Base 2003
Harley Davidson FXDL Dyna Low Rider Base 2004
Harley Davidson FXDL Dyna Low Rider Base 2005
Harley Davidson FXDL Dyna Low Rider Base 2007
Harley Davidson FXDLI Dyna Low Rider Base 2004
Harley Davidson FXDLI Dyna Low Rider Base 2005
Harley Davidson FXDLI Dyna Low Rider Base 2006
Harley Davidson FXDS-Conv Dyna Convertible Base 1999
Harley Davidson FXDS-Conv Dyna Convertible Base 2000
Harley Davidson FXDWG Dyna Wide Glide Base 1999
Harley Davidson FXDWG Dyna Wide Glide Base 2000
Harley Davidson FXDWG Dyna Wide Glide Base 2001
Harley Davidson FXDWG Dyna Wide Glide Base 2002
Harley Davidson FXDWG Dyna Wide Glide Base 2003
Harley Davidson FXDWG Dyna Wide Glide Base 2004
Harley Davidson FXDWG Dyna Wide Glide Base 2005
Harley Davidson FXDWG Dyna Wide Glide Base 2006
Harley Davidson FXDWG Dyna Wide Glide Base 2007
Harley Davidson FXDWGI Dyna Wide Glide Base 2004
Harley Davidson FXDWGI Dyna Wide Glide Base 2005
Harley Davidson FXDWGI Dyna Wide Glide Base 2006
Harley Davidson FXDX Dyna Super Glide Sport Base 1999
Harley Davidson FXDX Dyna Super Glide Sport Base 2000
Harley Davidson FXDX Dyna Super Glide Sport Base 2001
Harley Davidson FXDX Dyna Super Glide Sport Base 2002
Harley Davidson FXDX Dyna Super Glide Sport Base 2003
Harley Davidson FXDX Dyna Super Glide Sport Base 2004
Harley Davidson FXDXI Dyna Super Glide Sport Base 2004
Harley Davidson FXDXI Dyna Super Glide Sport Base 2005
Harley Davidson FXDXT Dyna Super Glide T-Sport Base 2001
Harley Davidson FXDXT Dyna Super Glide T-Sport Base 2002
Harley Davidson FXDXT Dyna Super Glide T-Sport Base 2003
Harley Davidson FXST Softail Standard Base 2000
Harley Davidson FXST Softail Standard Base 2001
Harley Davidson FXST Softail Standard Base 2002
Harley Davidson FXST Softail Standard Base 2003
Harley Davidson FXST Softail Standard Base 2004
Harley Davidson FXST Softail Standard Base 2005
Harley Davidson FXST Softail Standard Base 2006
Harley Davidson FXST Softail Standard Base 2007
Harley Davidson FXSTB Night Train Base 2000
Harley Davidson FXSTB Night Train Base 2001
Harley Davidson FXSTB Night Train Base 2002
Harley Davidson FXSTB Night Train Base 2003
Harley Davidson FXSTB Night Train Base 2004
Harley Davidson FXSTB Night Train Base 2005
Harley Davidson FXSTB Night Train Base 2006
Harley Davidson FXSTB Night Train Base 2007
Harley Davidson FXSTB Night Train Base 2008
Harley Davidson FXSTB Night Train Base 2009
Harley Davidson FXSTBI Night Train Base 2001
Harley Davidson FXSTBI Night Train Base 2002
Harley Davidson FXSTBI Night Train Base 2003
Harley Davidson FXSTBI Night Train Base 2004
Harley Davidson FXSTBI Night Train Base 2005
Harley Davidson FXSTBI Night Train Base 2006
Harley Davidson FXSTC Softail Custom Base 2007
Harley Davidson FXSTC Softail Custom Base 2008
Harley Davidson FXSTC Softail Custom Base 2009
Harley Davidson FXSTC Softail Custom Base 2010
Harley Davidson FXSTD Softail Deuce Base 2000
Harley Davidson FXSTD Softail Deuce Base 2001
Harley Davidson FXSTD Softail Deuce Base 2002
Harley Davidson FXSTD Softail Deuce Base 2003
Harley Davidson FXSTD Softail Deuce Base 2004
Harley Davidson FXSTD Softail Deuce Base 2005
Harley Davidson FXSTD Softail Deuce Base 2006
Harley Davidson FXSTD Softail Deuce Base 2007
Harley Davidson FXSTDI Softail Deuce Base 2001
Harley Davidson FXSTDI Softail Deuce Base 2002
Harley Davidson FXSTDI Softail Deuce Base 2003
Harley Davidson FXSTDI Softail Deuce Base 2004
Harley Davidson FXSTDI Softail Deuce Base 2005
Harley Davidson FXSTDI Softail Deuce Base 2006
Harley Davidson FXSTI Softail Standard Base 2001
Harley Davidson FXSTI Softail Standard Base 2002
Harley Davidson FXSTI Softail Standard Base 2003
Harley Davidson FXSTI Softail Standard Base 2004
Harley Davidson FXSTI Softail Standard Base 2005
Harley Davidson FXSTI Softail Standard Base 2006
Harley Davidson FXSTS Springer Softail Base 2000
Harley Davidson FXSTS Springer Softail Base 2001
Harley Davidson FXSTS Springer Softail Base 2002
Harley Davidson FXSTS Springer Softail Base 2003
Harley Davidson FXSTS Springer Softail Base 2004
Harley Davidson FXSTS Springer Softail Base 2005
Harley Davidson FXSTS Springer Softail Base 2006
Harley Davidson FXSTSI Springer Softail Base 2001
Harley Davidson FXSTSI Springer Softail Base 2002
Harley Davidson FXSTSI Springer Softail Base 2003
Harley Davidson FXSTSI Springer Softail Base 2004
Harley Davidson FXSTSI Springer Softail Base 2005
Harley Davidson FXSTSI Springer Softail Base 2006