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K&N RK-3947 High-Flow Air Intake System for Harley Davidson FLT/FLH Models 2008-2016
$349.02
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Hey there, fellow riders! If you're looking to kick up the performance of your Harley, let me tell you about the K&N RK-3947 High-Flow Air Intake System. This isn’t just some bolt-on part; it’s a game changer for your engine's airflow. Swapping out the stock air cleaner for this high-flow system can really wake up your ride. We’re talking about an estimated gain of around 7.43 horsepower at 4786 RPM. That’s a noticeable boost you’ll feel when you twist the throttle!

One of the best parts? This intake system comes with a K&N air filter that’s designed to keep the air flowing freely while also being super easy to maintain. It’s washable and reusable, so no need to keep buying replacements every few thousand miles. Just clean it, re-oil it, and you’re good to go. Plus, it’s pre-oiled and ready for installation right out of the box.

  • Air Filter Color: Red
  • Height: 2.125 in (54 mm)
  • Material: Cotton Gauze
  • Weight: 4.3 lb (2 kg)
  • Street Legal: Yep, it’s street legal in all US states (check your vehicle applications)
  • Warranty: No-Hassle Lifetime Limited

Now, let’s talk fitment. This system is designed for a bunch of Harley models, including:

  • FLHR Road King (2008-2016)
  • FLHT Electra Glide Standard (2008-2010)
  • FLHX Street Glide (2008-2016)
  • FLTR Road Glide (2008-2011)
  • And many more!

Just make sure to check your specific model to ensure a perfect fit. If you’re riding a Road King or an Electra Glide, this intake system is going to fit right in and make your bike breathe better.

For those who like to tinker, installation is pretty straightforward. You can find the install instructions here, and if you want to see the dyno results, check those out here.

So, if you want to add some real muscle to your Harley, this K&N intake is worth considering. It’s not just about the numbers; it’s about the ride. You’ll feel the difference, trust me!

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Vehicle
2008-2016
Harley Davidson FLHR Road King
2008
Harley Davidson FLHRSE4 Screamin Eagle Road King
2008-2009
Harley Davidson FLHT Electra Glide Standard
2008-2015
Harley Davidson FLHTCU Electra Glide Ultra
2015
Harley Davidson FLHTCUL Electra Glide Ultra Low
2009-2015
Harley Davidson FLHTCUTG Tri Glide Ultra
2010-2014
Harley Davidson FLHTK Electra Glide Ultra Limited
2015-2016
Harley Davidson FLHTK Ultra Limited
2015-2016
Harley Davidson FLHTKL Ultra Limited Low
2008-2016
Harley Davidson FLHX Street Glide
2014-2016
Harley Davidson FLHXS Street Glide Special
2010-2011
Harley Davidson FLHXXX Street Glide Trike
2015-2016
Harley Davidson FLRT Freewheeler
2016-2017
Harley Davidson FLS Softail Slim
2016-2017
Harley Davidson FLSS Softail Slim S
2016-2017
Harley Davidson FLSTF Fat Boy
2016
Harley Davidson FLSTFB Fat Boy Lo
2016-2017
Harley Davidson FLSTFBS Fat Boy Lo S
2016-2017
Harley Davidson FLSTN Softail Deluxe
2008-2011
Harley Davidson FLTR Road Glide
2011-2013
Harley Davidson FLTRU Road Glide Ultra
2015
Harley Davidson FLTRX Road Glide
2010-2013
Harley Davidson FLTRX Road Glide Custom
2015-2016
Harley Davidson FLTRXS Road Glide Special
2017
Harley Davidson FXDWG Dyna Wide Glide
2016-2017
Harley Davidson FXSB Breakout

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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