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K&N

K&N Cold Air Intake System: High-Flow Air Filter, Increase Performance & Acceleration: Compatible with 2008-2017 Harley Davidson: (See Product Descriptionf for Selected Models) RK-3951

  • Based on 34 reviews
Condition: New
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Availability: 13 left in stock
Fulfilled by Amazon
Arrives Saturday, Nov 8
Order within 2 hours and 22 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 ACCELERATION: K&N Air intake kit improves acceleration and uphill performance 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:2009-2012 HARLEY DAVIDSON FLHP Road King Police2008-2016 HARLEY DAVIDSON FLHR Road King2008-2013 HARLEY DAVIDSON FLHRC Road King Classic2008-2008 HARLEY DAVIDSON FLHRSE4 Screamin Eagle Road King2008-2010 HARLEY DAVIDSON FLHT Electra Glide Standard2008-2013 HARLEY DAVIDSON FLHTC Electra Glide Classic2012-2012 HARLEY DAVIDSON FLHTCU Electra Glide Ultra Classic2008-2013 HARLEY DAVIDSON FLHTCU Ultra Classic Electra Glide2010-2010 HARLEY DAVIDSON FLHTCUSE5 CVO Ultra Classic Electra Glide2009-2013 HARLEY DAVIDSON FLHTCUTG Tri Glide Ultra Classic2011-2014 HARLEY DAVIDSON FLHTK Electra Glide Ultra Limited2015-2016 HARLEY DAVIDSON FLHTK Ultra Limited2015-2016 HARLEY DAVIDSON FLHTKL Ultra Limited Low2009-2012 HARLEY DAVIDSON FLHTP Electra Glide Police2008-2016 HARLEY DAVIDSON FLHX Street Glide2014-2016 HARLEY DAVIDSON FLHXS Street Glide Special2010-2011 HARLEY DAVIDSON FLHXXX Street Glide Trike2015-2016 HARLEY DAVIDSON FLRT Freewheeler2016-2017 HARLEY DAVIDSON FLS Softail Slim2016-2017 HARLEY DAVIDSON FLSS Softail Slim S2016-2017 HARLEY DAVIDSON FLSTC Heritage Softail Classic2016-2017 HARLEY DAVIDSON FLSTF Fat Boy2016-2017 HARLEY DAVIDSON FLSTFB Softail Fat Boy Lo2016-2017 HARLEY DAVIDSON FLSTFBS Fat Boy S2016-2017 HARLEY DAVIDSON FLSTN Softail Deluxe2008-2011 HARLEY DAVIDSON FLTR Road Glide2011-2013 HARLEY DAVIDSON FLTRU Road Glide Ultra2015-2016 HARLEY DAVIDSON FLTRX Road Glide2010-2014 HARLEY DAVIDSON FLTRX Road Glide Custom2015-2016 HARLEY DAVIDSON FLTRXS Road Glide Special2016-2017 HARLEY DAVIDSON FXSB Breakout-

Brand: K&N


OEM Part Number: RK-3951


Global Trade Identification Number: 23


Manufacturer: K&N Engineering


Automotive Fit Type: Vehicle Specific Fit


Brand: ‎K&N


OEM Part Number: ‎RK-3951


Global Trade Identification Number: ‎23


Manufacturer: ‎K&N Engineering


Automotive Fit Type: ‎Vehicle Specific Fit


UPC: ‎024844364623


Model: ‎RK-3951


Item Weight: ‎4.72 pounds


Country of Origin: ‎China


Item model number: ‎RK-3951


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎RK-3951


Date First Available: February 10, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Nov 8

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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Top Amazon Reviews

    • It works for me
Easy swap out performs great looks good excellent finish to my stage 1 on my 08 Electra Glide ultra classic it does stick out a bit further than the factory one does I'm 6 foot so it doesn't bother me but someone with shorter legs might not like it
Reviewed in the United States on April 8, 2024 by Augie Ramos
    • Looks great
Review Image by Tommy Gee Tommy Gee
It was easy to install works great !
Reviewed in the United States on July 31, 2024 by Tommy Gee Tommy Gee
    • Awesome look.
What can I say? This is a K&N product It works perfectly and looks great thank you.
Reviewed in the United States on May 11, 2025 by The amp is absolutely wonderful. It works perfect on a 2016 Street Glide special under the fairing.!
    • Air intake
Review Image by Arthur,N.Rumrill Arthur,N.Rumrill
Review Image by Arthur,N.Rumrill Arthur,N.Rumrill
Review Image by Arthur,N.Rumrill Arthur,N.Rumrill
Wow! Great product, amazing look, fit perfectly.
Reviewed in the United States on July 5, 2023 by Arthur,N.Rumrill Arthur,N.Rumrill
    • Two Stars
No send it back
Reviewed in the United States on July 23, 2017 by Dnnorm
    • Pretty straight forward.
Review Image by Rox Rox
Easy to install and I’m just hoping I don’t have to “tune” my 2008 streetglide. 106”
Reviewed in the United States on May 16, 2023 by Rox Rox
    • Love the look but for some reason it didn't fit ...
Love the look but for some reason it didn't fit my bike I ad to make spacers for it
Reviewed in the United States on November 10, 2017 by Stephane Mousse
    • Very easy to install
I love the added performance and the way it looks on my bike
Reviewed in the United States on July 5, 2019 by Amazon Customer

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