K&N Engineering K&N Red Intake System for Harley Davidson RK-3909-1
K&N Engineering K&N Red Intake System for Harley Davidson RK-3909-1
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Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.
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Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.
Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.
Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.
Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.
After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.
Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.
For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.
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 |
