Description

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. 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.

Designed to increase horsepower & torque
Dyno-tuned velocity stack
Washable and reusable
Excellent air filtration

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
1999-2007	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