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K&N

K&N Cold Air Intake System: High-Flow Air Filter, Increase Performance & Acceleration: Compatible with 2001-2017 Harley Davidson: (See Product Description for Selected Models) RK-3950

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Availability: In Stock.
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Arrives Monday, Feb 9
Order within 23 hours and 15 minutes
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Features

  • DYNO TESTING YOU CAN TRUST: K&N air intake horsepower/torque testing is performed on wheel-based dynamometers and the reports are included with each intake system.
  • IMPROVED ENGINE SOUND - HEAR THE GROWL: K&Ns intake systems allow your engine to breathe and sound as it should- your engine will growl on acceleration and return to quiet once at speed.
  • BETTER TOWING: K&N Air intake kit improves acceleration and uphill performance when towing by improving throttle response, overall horsepower and torque. Excellent for daily and highway driving.
  • PREMIUM ENGINE PROTECTION FROM A TRUSTED BRAND: K&N air intake will not void manufacturer vehicle warranty & No-Hassle Lifetime Limited Warranty protects for the life of your vehicle.
  • HIGH-FLOW REUSABLE AIR FILTER: 4 layers of pleated, breathable cotton with K&Ns red filter oil to absorb dirt & dust particles, allowing clean air to continue flowing into your engine, only needs cleaning every 100k miles under normal highway conditions.
  • EASY TO INSTALL: Includes detailed, step-by-step instructions & all necessary parts- the entire air intake system can typically be installed in less than 60 minutes with basic hand tools.
  • MADE IN THE USA: Proudly made in the USA for trusted quality & reliability and backed by US based customer support.

Description

K&N is the inventor of the Air Intake System and has over 50 years of experience in the performance filtration industry. Proudly designed and manufactured in the USA, this premium cold air intake system is specifically designed for your vehicle and is dyno tested to provide a guaranteed increase in horsepower. It features a high flow intake tube, custom heat shield, and oversized K&N Washable High-Flow Cotton Air Filter for ultimate airflow. This Intake system replaces the restrictive OEM air box to provide an improved driving experience for daily driving or towing. It installs easily in about 60 minutes and is backed by a No-Hassle Lifetime Limited Warranty and will not void your factory warranty.Compatible Vehicles:2013-2016 HARLEY DAVIDSON FLD Switchback2007-2007 HARLEY DAVIDSON FLHR Road King2007-2007 HARLEY DAVIDSON FLHRC Road King Classic2002-2006 HARLEY DAVIDSON FLHRCI Road King Classic F/I2003-2006 HARLEY DAVIDSON FLHRI Road King F/I2007-2007 HARLEY DAVIDSON FLHRS Road King Custom2004-2006 HARLEY DAVIDSON FLHRSI Road King Custom F/I2007-2007 HARLEY DAVIDSON FLHT Electra Glide Standard2007-2007 HARLEY DAVIDSON FLHTC Electra Glide Classic2002-2006 HARLEY DAVIDSON FLHTCI Electra Glide Classic F/I2007-2007 HARLEY DAVIDSON FLHTCU Ultra Classic Electra Glide2002-2006 HARLEY DAVIDSON FLHTCUI Electra Glide Ultra Classic F/I2003-2006 HARLEY DAVIDSON FLHTI Electra Glide Standard F/I2007-2007 HARLEY DAVIDSON FLHX Street Glide2006-2006 HARLEY DAVIDSON FLHXI Street Glide F/I2012-2015 HARLEY DAVIDSON FLS Softail Slim2007-2015 HARLEY DAVIDSON FLSTC Heritage Softail Classic2002-2006 HARLEY DAVIDSON FLSTCI Heritage Softail Classic F/I2007-2015 HARLEY DAVIDSON FLSTF Fat Boy2010-2015 HARLEY DAVIDSON FLSTFB Softail Fat Boy Lo2001-2006 HARLEY DAVIDSON FLSTFI Fat Boy F/I2006-2006 HARLEY DAVIDSON FLSTI Heritage Softail F/I2007-2015 HARLEY DAVIDSON FLSTN Softail Deluxe2005-2006 HARLEY DAVIDSON FLSTNI Softail Deluxe F/I2008-2011 HARLEY DAVIDSON FLSTSB Softail Cross Bones2007-2007 HARLEY DAVIDSON FLSTSC Softail Springer Classic2005-2006 HARLEY DAVIDSON FLSTSCI Softail Springer Classic F/I2001-2003 HARLEY DAVIDSON FLSTSI Heritage Springer F/I2007-2007 HARLEY DAVIDSON FLTR Road Glide2002-2006 HARLEY DAVIDSON FLTRI Road Glide F/I2008-2009 HARLEY DAVIDSON FXCW Rocker2008-2011 HARLEY DAVIDSON FXCWC Rocker C

Brand: K&N


OEM Part Number: RK-3950


Global Trade Identification Number: 47


Manufacturer: K&N Engineering


Automotive Fit Type: Vehicle Specific Fit


Brand: ‎K&N


OEM Part Number: ‎RK-3950


Global Trade Identification Number: ‎47


Manufacturer: ‎K&N Engineering


Automotive Fit Type: ‎Vehicle Specific Fit


UPC: ‎024844364647


Model: ‎RK-3950


Item Weight: ‎4.7 pounds


Item model number: ‎RK-3950


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Machined


Manufacturer Part Number: ‎RK-3950


Date First Available: February 10, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Feb 9

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews


  • Perfect fitment better throttle response
Looks fantastic! Ordered this to replace a screamin eagle intake. At 5'8" the stock "football" cover really got in the way of my knee with forward controls, the k&n is still a little in the way but not nearly as bad. I immediately noticed a snappier throttle response and the ol butt dyno says it's got a little more power. Fitment on my 09 fxdb was flawless and installation was a breeze. The included instructions even have color photos, took 20-30 minutes to install with absolutely zero issues. ... show more
Reviewed in the United States on April 21, 2024 by Dustin Miller Dustin Miller

  • Good quality
Fit on my 2011 Harley Softail Blackline, bolted right up with no problems and was an easy upgrade from stock.
Reviewed in the United States on March 31, 2025 by Tyler j lankford

  • 2008 FXDF Fat Bob
Easy install and looks great on 2008 Fat Bob. Changes sound a bit. Not noticing a difference in performance but bike does backfire less than before. Drag Pipes were already installed and I have yet to tune. At this point, running well and don’t see a need for tune. Overall good purchase, nice look and maybe a bit more power. ... show more
Reviewed in the United States on October 5, 2022 by TM TM

  • Worth it
This actually worked ! Definitely I was surprised got it for looks,added boost to boot
Reviewed in the United States on August 15, 2025 by xlh

  • K&N quality.
Definitely loving the intake. Great look and sound just as good. Nice Balance of performance and oem look. Would definitely recommend
Reviewed in the United States on August 18, 2023 by Ricky Grohowski Ricky Grohowski

  • Not a happy customer
Came from the factory with a bad threaded head bolt...also two screws that held the outer cover on was cross threaded. I had to find a hardware store that sold something similar so I could install it. I have K& N filters on both bikes and filters in three vehicles. This was my first ever issue
Reviewed in the United States on June 16, 2025 by Rick Adams

  • Great in every way
Delivery with Express, great job. Look is very suitable for my taste. Must do a Mapping for the Bike now. The only thing is, you need a bypass plug because my 2014 Twin Cam has a Connection. But no problem with the Bypass, 20 Euro.
Reviewed in the United States on June 29, 2023 by ØLIVER ØLIVER

  • Perfect
Husband loved this. Easy to put on. Expensive but worth it.
Reviewed in the United States on October 23, 2024 by Tina Pope

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