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  See more parts for Harley Davidson FLD Switchback
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Harley Davidson K&N RK-3934 High-Flow Air Intake System for 1999-2008 Models, Chrome Finish - RK-3934
Harley Davidson K&N RK-3934 High-Flow Air Intake System for 1999-2008 Models, Chrome Finish - RK-3934 - Image 3 Harley Davidson K&N RK-3934 High-Flow Air Intake System for 1999-2008 Models, Chrome Finish - RK-3934 - Image 2 Harley Davidson K&N RK-3934 High-Flow Air Intake System for 1999-2008 Models, Chrome Finish - RK-3934 - Image 3

K&N RK-3934 High-Flow Air Intake System

The K&N RK-3934 is engineered to enhance the performance of your Harley-Davidson motorcycle by significantly improving airflow and increasing horsepower and torque. This high-flow air intake system replaces the stock OE air cleaner with a complete, high-performance setup designed for serious riders.

Key Features

  • Air Filter Color: Red
  • Air Filter Height: 2.25 in (57 mm)
  • Air Filter Material: Cotton Gauze
  • Washable: Yes
  • CARB EO Number: D-269-55/59
  • Finish: Chrome Top with Red Filter
  • Estimated Horsepower Gain: 10.23 HP @ 5155 RPM
  • Inlet Diameter: 2.313 in (59 mm)
  • Overall Height: 2.5 in (64 mm)
  • Weight: 4.8 lb (2.2 kg)
  • Mounting Hardware: Included
  • Street Legal: Yes, in all US states
  • Warranty: No-Hassle Lifetime Limited

Installation Notes

The RK-3934 comes with a durable mounting gasket to absorb vibrations, ensuring a smooth and secure installation. For detailed installation instructions, refer to the installation guide. Additionally, you can view the dyno results to see the performance improvements.

Confirmed Fitment

  • Harley Davidson FLHRCI Road King Classic 1999-2006
  • Harley Davidson FLHTCI Electra Glide Classic 1999-2006
  • Harley Davidson FLHTCUI Electra Glide Ultra Classic 1999-2006
  • Harley Davidson FLTRI Road Glide 1999-2006
  • Harley Davidson FLHRI Road King 2000-2006
  • Harley Davidson FLSTCI Heritage Softail Classic 2001-2006
  • Harley Davidson FLSTFI Fat Boy 2001-2006
  • Harley Davidson FLSTSI Heritage Springer 2001-2003
  • Harley Davidson FXSTBI Night Train 2001-2006
  • Harley Davidson FXSTDI Softail Deuce 2001-2006
  • Harley Davidson FXSTI Softail Standard 2001-2006
  • Harley Davidson FXSTSI Springer Softail 2001-2006
  • Harley Davidson FLHTI Electra Glide Standard 2003-2006
  • Harley Davidson FLHRSI Road King Custom 2004-2006
  • Harley Davidson FXDI Dyna Super Glide 2004-2006
  • Harley Davidson FXDLI Dyna Low Rider 2004-2006
  • Harley Davidson FXDWGI Dyna Wide Glide 2004-2006
  • Harley Davidson FXDXI Dyna Super Glide Sport 2004-2005
  • Harley Davidson FLSTNI Softail Deluxe 2005-2006
  • Harley Davidson FLSTSCI Softail Springer Classic 2005-2006
  • Harley Davidson FXDCI Super Glide Custom 2005-2006
  • Harley Davidson FLHXI Street Glide 2006
  • Harley Davidson FLSTI Heritage Softail 2006
  • Harley Davidson FXDBI Street Bob 2006
  • Harley Davidson FXDI35 Dyna 35th Anniversary Super Glide 2006
  • Harley Davidson FLHR Road King 2007
  • Harley Davidson FLHRC Road King Classic 2007
  • Harley Davidson FLHRS Road King Custom 2007
  • Harley Davidson FLHT Electra Glide Standard 2007
  • Harley Davidson FLHTC Electra Glide Classic 2007
  • Harley Davidson FLHTCU Electra Glide Ultra Classic 2007
  • Harley Davidson FLHX Street Glide 2007-2008
  • Harley Davidson FLSTC Heritage Softail Classic 2007-2015
  • Harley Davidson FLSTF Fat Boy 2007-2015
  • Harley Davidson FLSTN Softail Deluxe 2007-2015
  • Harley Davidson FLSTSC Softail Springer Classic 2007
  • Harley Davidson FLTR Road Glide 2007
  • Harley Davidson FXD Dyna Super Glide 2007-2010
  • Harley Davidson FXDB Street Bob 2007-2017
  • Harley Davidson FXDC Super Glide Custom 2007-2014
  • Harley Davidson FXDL Dyna Low Rider 2007-2017
  • Harley Davidson FXDWG Dyna Wide Glide 2007-2017
  • Harley Davidson FXST Softail Standard 2007-2009
  • Harley Davidson FXSTB Night Train 2007-2009
  • Harley Davidson FXSTC Softail Custom 2007-2010
  • Harley Davidson FXSTD Softail Deuce 2007
  • Harley Davidson FLSTSB Cross Bones 2008-2011
  • Harley Davidson FXCW Rocker 2008-2009
  • Harley Davidson FXCWC Rocker C 2008-2011
  • Harley Davidson FXDF Fat Bob 2008-2017
  • Harley Davidson FLSTFB Fat Boy Lo 2010-2015
  • Harley Davidson FXS Blackline 2011-2013
  • Harley Davidson FLD Switchback 2012-2016
  • Harley Davidson FLS Softail Slim 2012-2015
  • Harley Davidson FXDL Low Rider 2014-2017
  • Harley Davidson FXSB Breakout 2014-2015
Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2012-2016
 Harley Davidson FLD Switchback
2007
 Harley Davidson FLHR Road King
2000-2006
 Harley Davidson FLHRI Road King
2007
 Harley Davidson FLHRS Road King Custom
2004-2006
 Harley Davidson FLHRSI Road King Custom
2007
 Harley Davidson FLHT Electra Glide Standard
2007
 Harley Davidson FLHTCU Electra Glide Ultra
2003-2006
 Harley Davidson FLHTI Electra Glide Standard
2007-2008
 Harley Davidson FLHX Street Glide
2006
 Harley Davidson FLHXI Street Glide
2012-2015
 Harley Davidson FLS Softail Slim
2007-2015
 Harley Davidson FLSTF Fat Boy
2010-2015
 Harley Davidson FLSTFB Fat Boy Lo
2001-2006
 Harley Davidson FLSTFI Fat Boy
2006
 Harley Davidson FLSTI Heritage Softail
2007-2015
 Harley Davidson FLSTN Softail Deluxe
2005-2006
 Harley Davidson FLSTNI Softail Deluxe
2008-2011
 Harley Davidson FLSTSB Cross Bones
2001-2003
 Harley Davidson FLSTSI Heritage Springer
2007
 Harley Davidson FLTR Road Glide
1999-2006
 Harley Davidson FLTRI Road Glide
2008-2009
 Harley Davidson FXCW Rocker
2008-2011
 Harley Davidson FXCWC Rocker C
2007-2010
 Harley Davidson FXD Dyna Super Glide
2007-2017
 Harley Davidson FXDB Street Bob
2006
 Harley Davidson FXDBI Street Bob
2007-2014
 Harley Davidson FXDC Super Glide Custom
2005-2006
 Harley Davidson FXDCI Super Glide Custom
2008-2017
 Harley Davidson FXDF Fat Bob
2004-2006
 Harley Davidson FXDI Dyna Super Glide
2006
 Harley Davidson FXDI35 Dyna 35th Anniversary Super Glide
2007-2009, 2014-2017
 Harley Davidson FXDL Dyna Low Rider
2014-2017
 Harley Davidson FXDL Low Rider
2004-2006
 Harley Davidson FXDLI Dyna Low Rider
2017
 Harley Davidson FXDLS Low Rider S
2007-2008, 2010-2017
 Harley Davidson FXDWG Dyna Wide Glide
2004-2006
 Harley Davidson FXDWGI Dyna Wide Glide
2011-2013
 Harley Davidson FXS Blackline
2014-2015
 Harley Davidson FXSB Breakout
2007
 Harley Davidson FXST Softail Standard
2007-2009
 Harley Davidson FXSTB Night Train
2001-2006
 Harley Davidson FXSTBI Night Train
2007-2010
 Harley Davidson FXSTC Softail Custom
2007
 Harley Davidson FXSTD Softail Deuce
2001-2006
 Harley Davidson FXSTDI Softail Deuce
2001-2006
 Harley Davidson FXSTI Softail Standard
2001-2006
 Harley Davidson FXSTSI Springer Softail

K&N Logo

Who is Behind K&N Intakes?

K&N, formally known as K&N Engineering, Inc., is the world’s leading manufacturer of washable performance air filters and cold air intake systems. K&N manufactures over 12,000 parts for a wide range of makes and models of motorcycles, cars, SUV, trucks, industrial applications, and more. K&N was founded in 1969 and is headquartered in Riverside, California in a complex of 10 buildings compromising approximately 400,000 square feet. K&N also operates facilities in China, England, and the Netherlands.

In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N) developed a revolutionary idea for an air filter—one that could perform under the demands of dusty, dirty off-road environments. After experimenting with different types of filter media, they discovered that an oiled cotton design allowed the filter to capture contaminants efficiently, and also be washed and reused. It was right then and there that the original K&N High-Flow Air Filter was born. Fifty years later, K&N is still dominating the industry with leading filtration technology and innovative products that offer extraordinary protection for virtually every application out there.

What Makes K&N the Best?

All K&N products undergo rigorous testing to make sure they adhere to and exceed demanding quality standards. These tests include power, torque, and airflow tests to confirm that the intake products are maximizing power boost while retaining engine safety. The company stands behind its product 100 percent with some of the most extensive warranties in the business – a Million Mile Limited warranty. K&N’s performance air intake systems are designed to improve airflow to the engine by replacing the restrictive factory system with a single aerodynamic tube and highly efficient filter media. The systems are available in two materials. The first is Polyethylene, which is used to produce 57 and 63 series intake systems. The second one is aluminum, which can be found on the 69 and 77 series intake systems.

Advantages of K&N Intakes

The benefits of adding a K&N intake system to your car are plenty. Firstly, it will increase your vehicle’s horsepower and torque, while also improving fuel economy and the appearance of your engine bay. What’s more, it will deliver a satisfying, more aggressive exhaust note at higher RPMs. Each K&N intake includes an oversized filtering unit, which can go up to 100,000 miles between cleanings, unlike paper filters that can become clogged easily and cannot be washed or reused. In other words, with K&N products, you will never have to replace your air filter again.

Why Install an Aftermarket Intake?

Internal combustion engines all work as large air pumps. Air goes in, fuel is added, combustion occurs, and air goes out. This means there are two ways of increasing power: getting more air into the engine or making it easier for air to get out of the engine. Your air intake is responsible for filtering air before it enters your engine. Dirty air can damage the engine cylinder walls, so a high-quality filter is a must-have item. With a K&N system or filter, you increase airflow through the filter, which means more air is pulled into the engine. K&N does this without reducing filtration qualities, so your engine will live a long life.

Purchase K&N Intakes at Vivid Racing

Vivid Racing carries an extensive inventory of K&N products ranging from air filters, oil filters, air injection systems, fuel filters and pumps, sensors, carburetors, cold air intakes, and much, much more! If you cannot find a particular item above, please call us at (480) 966-3040 and we will help you find it. We are also here to answer any product questions, regarding usage, benefits, and fitment. Don’t delay! Improve your vehicle’s performance today with K&N Intakes.   

K&N Oil Filters | K&N Replacement Filters | K&N 57 Series Intakes | K&N 69 Series Typhoon Intakes
K&N 77 Series Intakes

K&N 10-YEAR/ MILLION MILE LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N OE Replacement Air Filter and Intake System (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for 10-Years or a Million Miles, whichever comes first, from the date the product was purchased. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

K&N 3-YEAR/ 300,000 MILE LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N Commercial Grade Diesel Air Filter (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for 3-Year or 300,000 miles, whichever comes first, from the date the product was purchased. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

K&N ONE YEAR LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N Oil Filter, Automotive Accessory, Universal, Special or Disposable Filter, Exhaust Systems (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for One Year from the date of purchase. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

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