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Description
K&N Oval Red 9in Intake System for Harley-DavidsonK&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
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.
Installation InstructionsUser 1
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2017 | Harley-Davidson | FLHR Road King | Base |
| 2007-2013 | 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 |
| 1999-2009 | Harley-Davidson | FLHT Electra Glide Standard | Base |
| 1999-2005,2007-2013 | Harley-Davidson | FLHTC Electra Glide Classic | Base |
| 2002-2006 | Harley-Davidson | FLHTCI Electra Glide Classic | Base |
| 2007-2017 | Harley-Davidson | FLHTCU Electra Glide Ultra Classic | Base |
| 2002-2006 | Harley-Davidson | FLHTCUI Electra Glide Ultra Classic | Base |
| 2009-2013 | Harley-Davidson | FLHTCUTG Tri Glide Ultra Classic | Base |
| 2003-2006 | Harley-Davidson | FLHTI Electra Glide Standard | Base |
| 2015-2017 | Harley-Davidson | FLHTKL Ultra Limited Low | Base |
| 2014-2017 | Harley-Davidson | FLHTKSE CVO Limited | Base |
| 2006-2017 | Harley-Davidson | FLHX Street Glide | Base |
| 2006 | Harley-Davidson | FLHXI Street Glide | Base |
| 2014-2017 | Harley-Davidson | FLHXS Street Glide Special | Base |
| 2010,2015-2017 | Harley-Davidson | FLHXSE CVO Street Glide | Base |
| 2010-2011 | Harley-Davidson | FLHXXX Street Glide Trike | Base |
| 2006 | Harley-Davidson | FLST Heritage Softail | Base |
| 1999-2017 | Harley-Davidson | FLSTC Heritage Softail Classic | Base |
| 2001-2006 | Harley-Davidson | FLSTCI Heritage Softail Classic | Base |
| 1999-2017 | Harley-Davidson | FLSTF Fat Boy | Base |
| 2010-2017 | 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 |
| 2008-2011 | Harley-Davidson | FLSTSB Cross Bones | Base |
| 2005-2007 | Harley-Davidson | FLSTSC Softail Springer Classic | Base |
| 2005-2006 | Harley-Davidson | FLSTSCI Softail Springer Classic | Base |
| 2010 | Harley-Davidson | FLSTSE CVO Softail Convertible | Base |
| 2001-2003 | Harley-Davidson | FLSTSI Heritage Springer | Base |
| 1999-2010,2016 | Harley-Davidson | FLTR Road Glide | Base |
| 2002-2006 | Harley-Davidson | FLTRI Road Glide | Base |
| 2011-2013,2016-2017 | Harley-Davidson | FLTRU Road Glide Ultra | Base |
| 2011,2015-2016 | Harley-Davidson | FLTRUSE CVO Road Glide Ultra | Base |
| 2010-2013 | Harley-Davidson | FLTRX Road Glide Custom | Base |
| 2015-2017 | Harley-Davidson | FLTRXS Road Glide Special | Base |
| 2012 | Harley-Davidson | FLTRXSE CVO Road Glide Custom | Base |
| 2008-2009 | Harley-Davidson | FXCW Rocker | Base |
| 2008-2011 | Harley-Davidson | FXCWC Rocker C | Base |
| 1999-2010 | 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 |
| 1999-2005,2007-2009,2014-2017 | 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 |
| 1999-2008,2010-2017 | Harley-Davidson | FXDWG Dyna Wide Glide | Base |
| 2004-2006 | Harley-Davidson | FXDWGI Dyna Wide Glide | Base |
| 1999-2005 | 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 |
| 1999-2009 | Harley-Davidson | FXSTB Night Train | Base |
| 2001-2006 | Harley-Davidson | FXSTBI Night Train | Base |
| 1999,2007-2010 | Harley-Davidson | FXSTC Softail Custom | Base |
| 2000-2007 | Harley-Davidson | FXSTD Softail Deuce | Base |
| 2001-2006 | Harley-Davidson | FXSTDI Softail Deuce | Base |
| 2003-2004 | Harley-Davidson | FXSTDSE Screamin Eagle Softail Deuce | Base |
| 2001-2006 | Harley-Davidson | FXSTI Softail Standard | Base |
| 1999-2006 | Harley-Davidson | FXSTS Springer Softail | Base |
| 2001-2006 | Harley-Davidson | FXSTSI Springer Softail | Base |
| 2007 | Harley-Davidson | FXSTSSE Screamin Eagle Softail Springer | Base |
| 2009 | Harley-Davidson | FXSTSSE3 CVO Softail Springer | Base |
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4.2 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 1
Kinda flimsy…
Thought the assembly was metal, it’s some kind of PVC.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 22, 2025
★★★★★ 5
Great references book.
Format: Hardcover
Excellent book for medical reference and refresh of knowledge.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
★★★★★ 5
A Wonderful Update To A Great Old Reference Book!
Format: Hardcover
It's the Merck Manual! If you know medicine but are aware you don't know EVERYTHING about EVERYTHING! (Few if any do!) This is a wonderful reference. If you have no medical knowledge and think this will make you know what doctors know. Don't waste your money. You have to have a basic understanding for this to be helpful. This is a wonderful update to an old favorite.
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Reviewed in the United States on July 16, 2025
★★★★★ 5
The most current and inclusive medical reference available mid-2018.
Format: Hardcover, Format: Hardcover
Here’s the review I wrote for the 19th edition on 2011: I've been getting and using the Merck Manual for over 30 years to answer questions about disease for family and friends (pediatrics through geriatrics) as well as preparing to ask germane questions of physicians responsible for care of family and friends. It is comprehensive in its coverage of the etiology, diagnosis, treatment and prognosis of diseases of the human body and contains the latest research results on the treatment options. It's really not that difficult for the layman to understand the medical terminology and the result is factual understanding of the major aspects of disease which you will NOT get from the standard home health care books from Johns Hopkins, Harvard, Mayo Clinic, the AMA or even the Merck Home Health handbook. And, unlike the Merck Manual, these books directed to the laity do not contain the diagnostic information upon which physicians decide precisely what disease they are presented with. Yes, there will be much superfluous information which you may never use, but, when you want and need the information about a specific disease, here's where you should start your education.
The same holds true for the updated 2018 20th edition. I neglected to mention that this manual also contains a plethora of ancillary information including thorough sections on pediatrics, geriatrics, injuries, bites and stings, patient care, alternative medicine, dietary supplements, rehabilitation, normal test values and even legal issues such as advance directives. Yup, it’s pricey, but it’s always proved to be valuable to me.
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Reviewed in the United States on June 15, 2018
★★★★★ 5
Great reference book
Format: Hardcover
If you only have one medical resource book in your house, I recommend this one. Very thorough book.
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Reviewed in the United States on March 3, 2026