K&N RK-3909-1 Intake System

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.

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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.

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Application Summary:

Year	Make/Model
1999-2007	Harley Davidson FLHR Road King
2007	Harley Davidson FLHRC Road King Classic
2002-2006	Harley Davidson FLHRCI Road King Classic
2003-2006	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
1999-2005	Harley Davidson FLHTC Electra Glide Classic
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
2006	Harley Davidson FLST Heritage Softail
2000-2012	Harley Davidson FLSTC Heritage Softail Classic
2002-2006	Harley Davidson FLSTCI Heritage Softail Classic
2000-2012	Harley Davidson FLSTF Fat Boy
2010-2012	Harley Davidson FLSTFB Fat Boy Lo
2001-2006	Harley Davidson FLSTFI Fat Boy
2006	Harley Davidson FLSTI Heritage Softail
2005-2012	Harley Davidson FLSTN Softail Deluxe
2005-2006	Harley Davidson FLSTNI Softail Deluxe
2000-2003	Harley Davidson FLSTS Heritage Springer
2005-2007	Harley Davidson FLSTSC Softail Springer Classic
2005-2006	Harley Davidson FLSTSCI Softail Springer Classic
2001-2003	Harley Davidson FLSTSI Heritage Springer
1999-2002	Harley Davidson FLTR Road Glide
2007	Harley Davidson FLTR Road Glide
2002-2006	Harley Davidson FLTRI Road Glide
2008-2009	Harley Davidson FXCW Rocker
2008-2011	Harley Davidson FXCWC Rocker C
1999-2005	Harley Davidson FXD Dyna Super Glide
2007	Harley Davidson FXD Dyna Super Glide
2007	Harley Davidson FXDB Street Bob
2006	Harley Davidson FXDBI Street Bob
2005	Harley Davidson FXDC Super Glide Custom
2007	Harley Davidson FXDC Super Glide Custom
2005-2006	Harley Davidson FXDCI Super Glide Custom
2004-2006	Harley Davidson FXDI Dyna Super Glide

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