K&N Engineering K&N Red Intake System for Harley Davidson RK-3909-1
KN Motorcycle Air Intake Systems- Harley Davidson
Air Cleaner Assembly
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.
Vehicle Fitments:
| 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 - 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 - 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 - 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 - 2007 | 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 |