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  See more parts for Harley-Davidson FLHR Road King
Select the year of your Harley-Davidson FLHR Road King:
K&N Intake System RK-3910-1 for Harley Davidson 1999-2007 Twin Cam, Red Filter, Billet Aluminum - RK-3910-1

K&N RK-3910-1 Air Intake System for Harley Davidson

The K&N RK-3910-1 air intake system is engineered specifically for Twin Cam Harley-Davidson engines, offering an effective upgrade for riders looking to enhance performance without compromising filtration. This assembly features K&N's renowned High-Flow Air Filter, which is complemented by a powder-coated billet aluminum back plate that integrates a dyno-tuned velocity stack, optimizing airflow to the engine.

Key Features

  • Air Filter Color: Red
  • Air Filter Height: 2.188 in (56 mm)
  • Air Filter Material: Cotton Gauze
  • Air Filter Washable: Yes
  • CARB EO Number: D-269-35/55
  • Color / Finish: Red Filter, Metal Top
  • Estimated Horsepower Gain: 10.76 HP @ 5206 RPM
  • Inlet Diameter: 2.25 in (57 mm)
  • Mounting Hardware Included: Yes
  • Overall Height: 2.188 in (56 mm)
  • Weight: 3.3 lb (1.5 kg)
  • Warranty: No-Hassle Lifetime Limited

Installation Notes

Fitment

  • Harley Davidson FLHR Road King 1999-2007
  • Harley Davidson FLHT Electra Glide Standard 1999-2007
  • Harley Davidson FLHTC Electra Glide Classic 1999-2007
  • Harley Davidson FLTR Road Glide 1999-2007
  • Harley Davidson FXD Dyna Super Glide 1999-2007
  • Harley Davidson FXDL Dyna Low Rider 1999-2007
  • Harley Davidson FXDS-Conv Dyna Convertible 1999-2000
  • Harley Davidson FXDWG Dyna Wide Glide 1999-2007
  • Harley Davidson FXDX Dyna Super Glide Sport 1999-2004
  • Harley Davidson FLSTC Heritage Softail Classic 2000-2012
  • Harley Davidson FLSTF Fat Boy 2000-2012
  • Harley Davidson FLSTS Heritage Springer 2000-2003
  • Harley Davidson FXST Softail Standard 2000-2009
  • Harley Davidson FXSTB Night Train 2000-2009
  • Harley Davidson FXSTD Softail Deuce 2000-2007
  • Harley Davidson FXSTS Springer Softail 2000-2006
  • Harley Davidson FLSTFI Fat Boy 2001-2006
  • Harley Davidson FLSTSI Heritage Springer 2001-2003
  • Harley Davidson FXDXT Dyna Super Glide T-Sport 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 FLHRCI Road King Classic 2002-2006
  • Harley Davidson FLHTCI Electra Glide Classic 2002-2006
  • Harley Davidson FLHTCUI Electra Glide Ultra Classic 2002-2006
  • Harley Davidson FLSTCI Heritage Softail Classic 2002-2006
  • Harley Davidson FLTRI Road Glide 2002-2006
  • Harley Davidson FLHRI Road King 2003-2006
  • Harley Davidson FLHTI Electra Glide Standard 2003-2006
  • Harley Davidson FLHRS Road King Custom 2004-2007
  • 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 FLSTN Softail Deluxe 2005-2012
  • Harley Davidson FLSTNI Softail Deluxe 2005-2006
  • Harley Davidson FLSTSC Softail Springer Classic 2005-2007
  • Harley Davidson FLSTSCI Softail Springer Classic 2005-2006
  • Harley Davidson FXDC Super Glide Custom 2005-2007
  • Harley Davidson FXDCI Super Glide Custom 2005-2006
  • Harley Davidson FLHX Street Glide 2006-2007
  • Harley Davidson FLHXI Street Glide 2006
  • Harley Davidson FLST Heritage Softail 2006
  • Harley Davidson FLSTI Heritage Softail 2006
  • Harley Davidson FXDBI Street Bob 2006
  • Harley Davidson FXDI35 Dyna 35th Anniversary Super Glide 2006
  • Harley Davidson FLHRC Road King Classic 2007
  • Harley Davidson FLHTCU Electra Glide Ultra Classic 2007
  • Harley Davidson FXDB Street Bob 2007
  • Harley Davidson FXSTC Softail Custom 2007-2010
  • Harley Davidson FXCW Rocker 2008-2009
  • Harley Davidson FXCWC Rocker C 2008-2011
  • Harley Davidson FLSTFB Fat Boy Lo 2010-2012
Proposition 65

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

Vehicle Make/Model
Harley-Davidson FLHR Road King 1999-2007 Base
Harley-Davidson FLHRI Road King 2003-2006 Base
Harley-Davidson FLHRS Road King Custom 2004-2007 Base
Harley-Davidson FLHRSI Road King Custom 2004-2006 Base
Harley-Davidson FLHT Electra Glide Standard 1999-2007 Base
Harley-Davidson FLHTCU Electra Glide Ultra Classic 2007 Base
Harley-Davidson FLHTI Electra Glide Standard 2003-2006 Base
Harley-Davidson FLHX Street Glide 2006-2007 Base
Harley-Davidson FLHXI Street Glide 2006 Base
Harley-Davidson FLST Heritage Softail 2006 Base
Harley-Davidson FLSTF Fat Boy 2000-2012 Base
Harley-Davidson FLSTFB Fat Boy Lo 2010-2012 Base
Harley-Davidson FLSTFI Fat Boy 2001-2006 Base
Harley-Davidson FLSTI Heritage Softail 2006 Base
Harley-Davidson FLSTN Softail Deluxe 2005-2012 Base
Harley-Davidson FLSTNI Softail Deluxe 2005-2006 Base
Harley-Davidson FLSTS Heritage Springer 2000-2003 Base
Harley-Davidson FLSTSI Heritage Springer 2001-2003 Base
Harley-Davidson FLTR Road Glide 1999-2002, 2007 Base
Harley-Davidson FLTRI Road Glide 2002-2006 Base
Harley-Davidson FXCW Rocker 2008-2009 Base
Harley-Davidson FXCWC Rocker C 2008-2011 Base
Harley-Davidson FXD Dyna Super Glide 1999-2007 Base
Harley-Davidson FXDB Street Bob 2007 Base
Harley-Davidson FXDBI Street Bob 2006 Base
Harley-Davidson FXDC Super Glide Custom 2005, 2007 Base
Harley-Davidson FXDCI Super Glide Custom 2005-2006 Base
Harley-Davidson FXDI Dyna Super Glide 2004-2006 Base
Harley-Davidson FXDI35 Dyna 35th Anniversary Super Glide 2006 Base
Harley-Davidson FXDL Dyna Low Rider 1999-2005, 2007 Base
Harley-Davidson FXDLI Dyna Low Rider 2004-2006 Base
Harley-Davidson FXDS-Conv Dyna Convertible 1999-2000 Base
Harley-Davidson FXDWG Dyna Wide Glide 1999-2007 Base
Harley-Davidson FXDWGI Dyna Wide Glide 2004-2006 Base
Harley-Davidson FXDXT Dyna Super Glide T-Sport 2001-2003 Base
Harley-Davidson FXST Softail Standard 2000-2007 Base
Harley-Davidson FXSTB Night Train 2000-2009 Base
Harley-Davidson FXSTBI Night Train 2001-2006 Base
Harley-Davidson FXSTC Softail Custom 2007-2010 Base
Harley-Davidson FXSTD Softail Deuce 2000-2007 Base
Harley-Davidson FXSTDI Softail Deuce 2001-2006 Base
Harley-Davidson FXSTI Softail Standard 2001-2006 Base
Harley-Davidson FXSTS Springer Softail 2000-2006 Base
Harley-Davidson FXSTSI Springer Softail 2001-2006 Base

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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