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 back plate 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.
User 1Installation InstructionsThis Part Fits:
| Year |
Make |
Model |
Submodel |
| 1999-2007 |
Harley-Davidson |
FLHR Road King |
Base |
| 2007 |
Harley-Davidson |
FLHRC Road King Classic |
Base |
| 2002-2006 |
Harley-Davidson |
FLHRCI Road King Classic |
Base |
| 2003-2006 |
Harley-Davidson |
FLHRI Road King |
Base |
| 2004-2007 |
Harley-Davidson |
FLHRS Road King Custom |
Base |
| 2004-2006 |
Harley-Davidson |
FLHRSI Road King Custom |
Base |
| 1999-2007 |
Harley-Davidson |
FLHT Electra Glide Standard |
Base |
| 1999-2005,2007 |
Harley-Davidson |
FLHTC Electra Glide Classic |
Base |
| 2002-2006 |
Harley-Davidson |
FLHTCI Electra Glide Classic |
Base |
| 2007 |
Harley-Davidson |
FLHTCU Electra Glide Ultra Classic |
Base |
| 2002-2006 |
Harley-Davidson |
FLHTCUI Electra Glide Ultra Classic |
Base |
| 2003-2006 |
Harley-Davidson |
FLHTI Electra Glide Standard |
Base |
| 2006-2007 |
Harley-Davidson |
FLHX Street Glide |
Base |
| 2006 |
Harley-Davidson |
FLHXI Street Glide |
Base |
| 2006 |
Harley-Davidson |
FLST Heritage Softail |
Base |
| 2000-2012 |
Harley-Davidson |
FLSTC Heritage Softail Classic |
Base |
| 2002-2006 |
Harley-Davidson |
FLSTCI Heritage Softail Classic |
Base |
| 2000-2012 |
Harley-Davidson |
FLSTF Fat Boy |
Base |
| 2010-2012 |
Harley-Davidson |
FLSTFB Fat Boy Lo |
Base |
| 2001-2006 |
Harley-Davidson |
FLSTFI Fat Boy |
Base |
| 2006 |
Harley-Davidson |
FLSTI Heritage Softail |
Base |
| 2005-2012 |
Harley-Davidson |
FLSTN Softail Deluxe |
Base |
| 2005-2006 |
Harley-Davidson |
FLSTNI Softail Deluxe |
Base |
| 2000-2003 |
Harley-Davidson |
FLSTS Heritage Springer |
Base |
| 2005-2007 |
Harley-Davidson |
FLSTSC Softail Springer Classic |
Base |
| 2005-2006 |
Harley-Davidson |
FLSTSCI Softail Springer Classic |
Base |
| 2001-2003 |
Harley-Davidson |
FLSTSI Heritage Springer |
Base |
| 1999-2002,2007 |
Harley-Davidson |
FLTR Road Glide |
Base |
| 2002-2006 |
Harley-Davidson |
FLTRI Road Glide |
Base |
| 2010-2011 |
Harley-Davidson |
FLTRX Road Glide Custom |
Base |
| 2008-2009 |
Harley-Davidson |
FXCW Rocker |
Base |
| 2008-2011 |
Harley-Davidson |
FXCWC Rocker C |
Base |
| 1999-2007 |
Harley-Davidson |
FXD Dyna Super Glide |
Base |
| 2007 |
Harley-Davidson |
FXDB Street Bob |
Base |
| 2006 |
Harley-Davidson |
FXDBI Street Bob |
Base |
| 2005,2007 |
Harley-Davidson |
FXDC Super Glide Custom |
Base |
| 2005-2006 |
Harley-Davidson |
FXDCI Super Glide Custom |
Base |
| 2004-2006 |
Harley-Davidson |
FXDI Dyna Super Glide |
Base |
| 2006 |
Harley-Davidson |
FXDI35 Dyna 35th Anniversary Super Glide |
Base |
| 1999-2005,2007 |
Harley-Davidson |
FXDL Dyna Low Rider |
Base |
| 2004-2006 |
Harley-Davidson |
FXDLI Dyna Low Rider |
Base |
| 1999-2000 |
Harley-Davidson |
FXDS-Conv Dyna Convertible |
Base |
| 1999-2007 |
Harley-Davidson |
FXDWG Dyna Wide Glide |
Base |
| 2004-2006 |
Harley-Davidson |
FXDWGI Dyna Wide Glide |
Base |
| 1999-2004 |
Harley-Davidson |
FXDX Dyna Super Glide Sport |
Base |
| 2004-2005 |
Harley-Davidson |
FXDXI Dyna Super Glide Sport |
Base |
| 2001-2003 |
Harley-Davidson |
FXDXT Dyna Super Glide T-Sport |
Base |
| 2000-2009 |
Harley-Davidson |
FXST Softail Standard |
Base |
| 2000-2009 |
Harley-Davidson |
FXSTB Night Train |
Base |
| 2001-2006 |
Harley-Davidson |
FXSTBI Night Train |
Base |
| 2007-2010 |
Harley-Davidson |
FXSTC Softail Custom |
Base |
| 2000-2007 |
Harley-Davidson |
FXSTD Softail Deuce |
Base |
| 2001-2006 |
Harley-Davidson |
FXSTDI Softail Deuce |
Base |
| 2001-2006 |
Harley-Davidson |
FXSTI Softail Standard |
Base |
| 2000-2006 |
Harley-Davidson |
FXSTS Springer Softail |
Base |
| 2001-2006 |
Harley-Davidson |
FXSTSI Springer Softail |
Base |
