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2008-2015 Harley-Davidson Cycles Get K&N Intake with Taller Air Filter for Better Airflow

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K&N RK-3947XB Air Intake System for Harley Davidson motorcycles

The K&N RK-3947XB Air Intake System features a washable and reusable air filter that is pre-oiled and ready to roll right out of the box.

Arguably the most popular motorcycle manufacturer in the world, Harley-Davidson® was created in Milwaukee, Wisconsin, in 1903 and is one of two American motorcycle builders to survive the Great Depression.

K&N RK-3947XB Air Intake System components for Harley Davidson motorcycles

Everything to install the system is included in the box. All you need is some basic hand tools and around 90 minutes of time and you'll be cruising down the road in style.

Known as the originator of the chopper style of motorcycles, it has traditionally offered heavyweight, air-cooled cruisers with an engine displacement greater than 700cc and also known for V-Twin Racing Street Custom (VRSC) and middleweight street platforms.

In 1901, prior to the launch of the business, 20-year-old William S. Harley drew up a plan for the company's first motor bicycle that included a small engine with a 7.07-cubic inch (116 cc) displacement and 4-inch (102 mm) flywheel with the idea of integrating it to a regular pedal-bicycle frame. Harley enlisted the help of childhood friend Arthur Davidson and Arthur's brother Walter and the three tinkered for the next two years resulting in the creation of a motor-bicycle.

While riding the contraption, the three discovered that it wasn't powerful enough to climb the hills around Milwaukee without some pedal assistance and they dropped it and immediately started developing an improved second-generation machine that featured a 24.74-cubic inch (405 cc) engine with 9.75 inches (25 cm) flywheels. The loop frame design of a larger engine took the machine out of the category of a motor bicycle and it became the forerunner of what we now know as a motorcycle.

In 1905 and 1906, they were producing single-cylinder models with a 26.84-cubic inch (440 cc) engine and in February 1907 a prototype model with a 45-degree V-Twin engine was showcased at the Chicago Automobile Show.

The 45-degree angle of the engine received several United States patents and allowed more torque in a relatively small space. The layout causes the cylinders to fire at uneven intervals producing a distinctive choppy sound that has been associated with the Harley-Davidson brand.

Through the years Harley-Davidson has produced a variety of engines to power its motorcycles including 13 Big V-twins, eight Small V-twins, the Revolution and single-cylinder engines.

Harley-Davidson has produced various models including the Touring (Road King, Road Glide, Street Glide, and Electra Glide), Softail, Dyna (Super Glide), Sportster, VRSC, VRXSE, and Street.

K&N offers the RK-3947XB air intake system designed for many H-D® motorcycles. The motorcycle air intake system is guaranteed to enhance the horsepower and torque of the engine. It does this by using an oversized air filter designed to provide more airflow to the engine.

The air intake system includes a sturdy aluminum backing plate that mounts directly to the throttle body through an aluminum integrated, internal-run breather system making installation a breeze. A durable mounting gasket is included to absorb vibration.

The intake system includes a K&N air filter that features multiple layers of cotton gauze media that has been treated with a special grade of filter oil that is so tacky, it captures and holds dirt particles.

K&N RK-3947XB Air Intake System installed on a Harley Davidson motorcycle

Once installed, the RK-3947XB not only looks great, but performs better than the factory system. Providing more air for the engine, thus making more power.

 

The air filter is washable and reusable. K&N recommends cleaning it at least once a year, depending on driving conditions. K&N offers the air filter cleaning kit 99-5000 to clean and re-oil your filter again and again. K&N is so sure of the quality of the air filter it backs it with a K&N Million Mile Limited Warranty® that claims it will last for up to 10 years or 1,000,000 miles.

The K&N RK-3947XB air intake system fits the following Harley-Davidson models:
2015 HARLEY DAVIDSON FLTRXS ROAD GLIDE SPECIAL 103 CI
2015 HARLEY DAVIDSON FLTRX ROAD GLIDE 103 CI
2015 HARLEY DAVIDSON FLRT FREEWHEELER 103 CI
2015 HARLEY DAVIDSON FLHXS STREET GLIDE SPECIAL 103 CI
2015 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI
2015 HARLEY DAVIDSON FLHTKL ULTRA LIMITED LOW 103 CI
2015 HARLEY DAVIDSON FLHTK ULTRA LIMITED 103 CI
2015 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA 103 CI
2015 HARLEY DAVIDSON FLHTCUL ELECTRA GLIDE ULTRA CLASSIC LOW 103 CI
2015 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI
2015 HARLEY DAVIDSON FLHR ROAD KING 103 CI
2014 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI
2014 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI
2014 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA 103 CI
2014 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI
2014 HARLEY DAVIDSON FLHR ROAD KING 103 CI
2013 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 103 CI
2013 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI
2013 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI
2013 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI
2013 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI
2013 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 103 CI
2013 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 103 CI
2013 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI
2013 HARLEY DAVIDSON FLHR ROAD KING 103 CI
2012 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 103 CI
2012 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI
2012 HARLEY DAVIDSON FLHX STREET GLIDE 103 CI
2012 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI
2012 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI
2012 HARLEY DAVIDSON FLHTCU ELECTRA GLIDE ULTRA CLASSIC 103 CI
2012 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 103 CI
2012 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI
2012 HARLEY DAVIDSON FLHR ROAD KING 103 CI
2011 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI
2011 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 103 CI
2011 HARLEY DAVIDSON FLHXXX STREET GLIDE TRIKE 103 CI
2011 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI
2011 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI
2011 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI
2011 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI
2011 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI
2011 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI
2011 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 103 CI
2011 HARLEY DAVIDSON FLHR ROAD KING 96 CI
2011 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI
2010 HARLEY DAVIDSON FLTRX ROAD GLIDE CUSTOM 96 CI
2010 HARLEY DAVIDSON FLHXXX STREET GLIDE TRIKE 103 CI
2010 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI
2010 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI
2010 HARLEY DAVIDSON FLHTK ELECTRA GLIDE ULTRA LIMITED 103 CI
2010 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI
2010 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI
2010 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI
2010 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI
2010 HARLEY DAVIDSON FLHR ROAD KING 96 CI
2010 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI
2009 HARLEY DAVIDSON FLTR ROAD GLIDE 96 CI
2009 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI
2009 HARLEY DAVIDSON FLHTP ELECTRA GLIDE POLICE 103 CI
2009 HARLEY DAVIDSON FLHTCUTG TRI GLIDE ULTRA CLASSIC 103 CI
2009 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI
2009 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI
2009 HARLEY DAVIDSON FLHT ELECTRA GLIDE STANDARD 96 CI
2009 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI
2009 HARLEY DAVIDSON FLHR ROAD KING 96 CI
2009 HARLEY DAVIDSON FLHP ROAD KING POLICE 103 CI
2008 HARLEY DAVIDSON FLTR ROAD GLIDE 96 CI
2008 HARLEY DAVIDSON FLHX STREET GLIDE 96 CI
2008 HARLEY DAVIDSON FLHTCU ULTRA CLASSIC ELECTRA GLIDE 96 CI
2008 HARLEY DAVIDSON FLHTC ELECTRA GLIDE CLASSIC 96 CI
2008 HARLEY DAVIDSON FLHT ELECTRA GLIDE STANDARD 96 CI
2008 HARLEY DAVIDSON FLHRC ROAD KING CLASSIC 96 CI
2008 HARLEY DAVIDSON FLHR ROAD KING 96 CI

You can view all the K&N performance products for any vehicle by using the Search by Vehicle tool and you can find a local K&N retailer by plugging your location into the K&N Dealer Search as well.


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K&N Engineering in Riverside California is the world's leading manufacturer of washable performance air filters and air intake systems. K&N invented the reusable high flow cotton air filter in 1969 and has been perfecting the technology ever since. K&N is a world class filtration company selling air filters, oil filters, and intakes in over 50 countries. K&N sells over 5,000 products designed for cars, trucks, motorcycles, engines, and industrial applications. From their Million Mile Warranty to their Consumer Protection Pledge, K&N stands behind their products and their consumers 100%. The distinctive K&N logo represents performance from one of the original performance companies. For more information, visit knfilters.com.