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The K&N VF4000 cabin air filter is electrostatically charged to hold dirt and dust and is backed by a 10-Year/Million Mile Limited Warranty.

BMW offers all kinds of models under its number series like the five and six series and its letter series like the M.

The M (for Motorsport) series cars were initially introduced to support BMW's successful racing program of the 1960s and 1970s. However, the moniker soon became to be used to help fill out the company's stable of vehicles. These models are the modified higher trim models. These cars include modified engines, transmissions, suspensions, interior trims, aerodynamics and exterior changes that helped to set them apart from their colleagues.

The first of the M series cars to be offered was the M1, which was a sports car unveiled in 1978 and sold through 1981.

Today the M-Series stable includes the M2, a coupe introduced in 2015; the M3, a sedan unveiled in 2014; the M4, a coupe and cabriolet introduced in 2014; the M5, a sedan released in 2012; the M6, a cabriolet and coupe that was first offered in 2012 and a Gran Coupe that came out in 2013.

Nineteen different engines have been used to power M-Series cars. From 2004-2010, a 5.0-liter V10 engine that generated 507 PS powered the M5 4-door sedan and station wagon. From 2005-2010, a 5.0-liter V10 engine that delivers 507 PS powered the M6 coupe and convertible.

The second-generation 6 series including the 630i, 645CI, 635D, and 650i was introduced in 2003. A 3.0-liter straight 6 engine with valvetronic and dual yanos technology powered the 630Ci and 630i. A 3.0-liter diesel straight 6 engine with twin-turbocharger powered the 635d. BMW claimed that this was the first diesel Gran Tourer when it was released. This model offered more power, torque and fuel economy than the 630i.

A 4.4-liter V8 that produced 329-horsepower and 330 lb-ft of torque powered the 645Ci. Production of the car was stopped in 2005 and the 650i, a bigger and quicker car, replaced it in 2006. A 4.8-liter V8 engine that delivered 360-horsepower and 360 lb-ft of torque powered the 650i.

BMW introduced the 5 series in 1972. Initially, the car came in only a sedan body style. The touring body style was added in 1991 and the 5-door hatchback (known as the Gran Touring) was added in 2009.

The 5 is BMW's second best-selling series after the 3-series and in 2010 accounted for about half of BMW's profits. On January 29, 2008, the 5 millionth 5-series was manufactured, a 530d sedan. The 5-series includes the BMW 528, 528i, 525i, 520i, the 530i, and the 535i.

The fifth generation of the series started in 2004 and ran through 2010. This particular 5-series featured a longer and wider chassis than the previous generation and included iDrive, Active Roll Stabilization, Active Cruise Control, Park Distance Control and a Harman Kardon Logic7 sound system. The 4.4-liter V8 that powered this generation delivered 325-horsepower and was mated to a 6-speed manual or automatic transmission or newly created 6-speed Sequential Manual Gearbox that featured steering wheel-mounted shift paddles.

The 5-series is currently in its sixth generation. These models are greater in length than the previous generations, permitting more rear legroom. These models are also the first BMWs to feature the new ZF eight-speed automatic transmission and a new brake energy regeneration system.

Alpina Burkard Bovensiepen GmbH is a German automobile manufacturer who works with BMW in the design and manufacturing of the Alpina. Recognized as an automobile manufacturer, the company is actually more of an aftermarket tuner. The company enhances BMW cars and releases the results as an Alpina.

Anyone who owns the "Ultimate Driving Machine" is going to want to be sure that its passenger cabin smells fresh and is healthy to occupy. K&N offers the VF4000 cabin air filter for this purpose.

Designed and manufactured to freshen and clean incoming air into the car's cabin, the filter captures most molds, mildew, fungus, spores, bacteria, germs, pollen and allergens.

The filter is electrostatically charged so that it can capture and hold impurities until it is cleaned. K&N recommends this be done every 12 months or 12,000 miles, depending on driving conditions. It is also designed to fit the factory cabin air filter box and is pre-treated and ready to install straight out of the box.

K&N offers a cabin air filter cleaning kit that includes a substance that cleans out the impurities as well as a substance that recharges the electrostatic properties of the cabin air filter so that it can be used over and over again.

Installation of the cabin air filter is simple. Simply remove the old filter from the factory box that is located in one of three locations –- under the hood, near the windshield; underneath the dashboard; or behind the glove box. Once the old filter has been removed, simply drop the new K&N filter into the box.

Most cabin air filters can be replaced without tools. However, you may need basic hand tools to open the cover of the cabin air filter compartment.

K&N is so sure that the cabin air filter will perform as promised it covers it with a 10-Year/Million Mile Limited Warranty.

The K&N VF4000 cabin air filter fits the following vehicles:

2011 BMW M6 5.0L V10
2011 BMW 650I 4.8L V8
2011 BMW 635D 3.0L L6 DIESEL
2011 BMW 630I 3.0L L6
2010 BMW M6 5.0L V10
2010 BMW M5 5.0L V10
2010 BMW ALPINA B6 4.4L V8
2010 BMW ALPINA B5 4.4L V8
2010 BMW 650I 4.8L V8
2010 BMW 635D 3.0L L6 DIESEL
2010 BMW 630I 3.0L L6
2010 BMW 550I 4.8L V8 - E60, E61
2010 BMW 540I 4.0L V8
2010 BMW 535I XDRIVE 3.0L L6 - E60, E61
2010 BMW 535I GT 3.0L L6 - E60, E61
2010 BMW 535I 3.0L L6 - E60, E61
2010 BMW 535D 3.0L L6 DIESEL - E60, E61
2010 BMW 530I 3.0L L6 - E60, E61
2010 BMW 530D 3.0L L6 DIESEL - E60, E61
2010 BMW 525I 3.0L L6 - E60, E61
2010 BMW 525I 2.5L L6 - E60, E61
2010 BMW 525D 3.0L L6 DIESEL - E60, E61
2010 BMW 523I 2.5L L6 - E60, E61
2010 BMW 520I 2.0L L6 - E60, E61
2010 BMW 520I 2.0L L4 - E60, E61
2010 BMW 520D 2.0L L4 DIESEL - E60, E61
2009 BMW M6 5.0L V10
2009 BMW M5 5.0L V10
2009 BMW ALPINA B6 4.4L V8
2009 BMW ALPINA B5 4.4L V8
2009 BMW 650I 4.8L V8
2009 BMW 635D 3.0L L6 DIESEL
2009 BMW 630I 3.0L L6
2009 BMW 550I 4.8L V8
2009 BMW 540I 4.0L V8
2009 BMW 535I GT 3.0L L6
2009 BMW 535I 3.0L L6
2009 BMW 535D 3.0L L6 DIESEL
2009 BMW 530I 3.0L L6
2009 BMW 530D 3.0L L6 DIESEL
2009 BMW 525I 3.0L L6
2009 BMW 525I 2.5L L6
2009 BMW 525D 3.0L L6 DIESEL
2009 BMW 523I 2.5L L6
2009 BMW 520I 2.0L L6
2009 BMW 520D 2.0L L4 DIESEL
2008 BMW M6 5.0L V10
2008 BMW M5 5.0L V10
2008 BMW ALPINA B6 4.4L V8
2008 BMW ALPINA B5 4.4L V8
2008 BMW 650I 4.8L V8
2008 BMW 635D 3.0L L6 DIESEL
2008 BMW 630I 3.0L L6
2008 BMW 550I 4.8L V8
2008 BMW 540I 4.0L V8
2008 BMW 535I 3.0L L6
2008 BMW 535D 3.0L L6 DIESEL
2008 BMW 530I 3.0L L6
2008 BMW 530D 3.0L L6 DIESEL
2008 BMW 525I 3.0L L6
2008 BMW 525I 2.5L L6
2008 BMW 525D 2.5L L6 DIESEL
2008 BMW 523I 2.5L L6
2008 BMW 520I 2.0L L6
2008 BMW 520D 2.0L L4 DIESEL
2007 BMW M6 5.0L V10
2007 BMW M5 5.0L V10
2007 BMW ALPINA B6 4.4L V8
2007 BMW ALPINA B5 4.4L V8
2007 BMW 650I 4.8L V8
2007 BMW 635D 3.0L L6 DIESEL
2007 BMW 630I 3.0L L6
2007 BMW 550I 4.8L V8
2007 BMW 540I 4.0L V8
2007 BMW 535I 3.0L L6
2007 BMW 535D 3.0L L6 DIESEL
2007 BMW 530I 3.0L L6
2007 BMW 530D 3.0L L6 DIESEL
2007 BMW 525I 3.0L L6
2007 BMW 525I 2.5L L6
2007 BMW 525D 2.5L L6 DIESEL
2007 BMW 523I 2.5L L6
2007 BMW 520I 2.0L L6
2007 BMW 520D 2.0L L4 DIESEL
2006 BMW M6 5.0L V10
2006 BMW M5 5.0L V10
2006 BMW ALPINA B6 4.4L V8
2006 BMW ALPINA B5 4.4L V8
2006 BMW 650I 4.8L V8
2006 BMW 635D 3.0L L6 DIESEL
2006 BMW 630I 3.0L L6
2006 BMW 550I 4.8L V8
2006 BMW 540I 4.0L V8
2006 BMW 535D 3.0L L6 DIESEL
2006 BMW 530I 3.0L L6
2006 BMW 530D 3.0L L6 DIESEL
2006 BMW 525I 3.0L L6
2006 BMW 525I 2.5L L6
2006 BMW 525D 2.5L L6 DIESEL
2006 BMW 523I 2.5L L6
2006 BMW 520I 2.0L L6
2006 BMW 520D 2.0L L4 DIESEL
2005 BMW M6 5.0L V10
2005 BMW M5 5.0L V10
2005 BMW ALPINA B5 4.4L V8
2005 BMW 650I 4.8L V8
2005 BMW 645CI 4.4L V8
2005 BMW 635D 3.0L L6 DIESEL
2005 BMW 630I 3.0L L6
2005 BMW 550I 4.8L V8
2005 BMW 545I 4.4L V8
2005 BMW 540I 4.0L V8
2005 BMW 535D 3.0L L6 DIESEL
2005 BMW 530I 3.0L L6
2005 BMW 530D 3.0L L6 DIESEL
2005 BMW 525I 2.5L L6
2005 BMW 525D 2.5L L6 DIESEL
2005 BMW 523I 2.5L L6
2005 BMW 520I 2.0L L6
2005 BMW 520D 2.0L L4 DIESEL
2004 BMW 645CI 4.4L V8
2004 BMW 630I 3.0L L6
2004 BMW 545I 4.4L V8
2004 BMW 530I 3.0L L6 - E60, E61
2004 BMW 530D 3.0L L6 DIESEL
2004 BMW 525I 2.5L L6
2004 BMW 525D 2.5L L6 DIESEL
2004 BMW 520I 2.0L L6
2003 BMW 545I 4.4L V8
2003 BMW 530I 3.0L L6 - E60
2003 BMW 530D 3.0L L6 DIESEL - E60, E61
2003 BMW 525I 2.5L L6 - E60, E61
2003 BMW 520I 2.0L L6 - E60, E61

Use the K&N Search by Vehicle Tool to find the proper K&N cabin air filter for your car, truck, or SUV. K&N is always creating new cabin air filters. If you can't find a filter for your particular vehicle, please ask us to make one for you using the online product request form.

The K&N SU-6006 washable and reusable replacement air filter will last for up to 10 years or 1,000,000 miles without requiring replacement.

Headquartered in Japan, Suzuki Motor Corporation is a multinational business that manufactures automobiles, ATVs, motorcycles, marine engines, wheelchairs and a variety of small internal combustion engines.

Founded in 1909 as a manufacturer of weaving looms for a booming silk industry, Suzuki began building cars in 1937 that were powered by a then-innovative, liquid-cooled, four-stroke, four-cylinder engine. It featured a cast aluminum crankcase and gearbox and delivered 13-horsepower from a displacement of less than 800 cc.

The company was forced to give up its automobile manufacturing during World War II and after the war it returned to constructing looms The United States government approved the export of cotton to Japan, which appeared to provide a boost to the textile market, but by 1951 the domestic market collapsed.

As a result, Suzuki returned to manufacturing motor vehicles including motor-bicycles, two-wheel vehicles powered by a motor. Known as the Power Free, by 1952 it was being powered by a 36 cc one horsepower, two-stroke engine. An innovative double-sprocket gear system allowed the rider to either pedal with the engine assisting, pedal without engine assist, or simply disconnect the pedals and run on engine power only. The new democratic government granted Suzuki a financial subsidy so that it could continue research on the vehicle.

By 1954, Suzuki was producing 6,000 motorcycles a month.

Today, the company manufactures a number of motorcycle models including the GSR750 (also known as the GSX-S750) and the GSR600.

Unveiled in 2011, the GSR750 features a 6-speed transmission with multi-plate clutch and a 749 cc, liquid-cooled, DOHC inline 4-cylinder fuel injected engine with 16 valves that delivers 106-horsepower.

The rider has the capability of adjusting the brightness of the instrument cluster that include an easy-to-read analogue tachometer and a large digital LCD speedometer with average fuel consumption meter, gear position indicator, fuel gauge, odometer/trip meter and a clock.

The current generation GSX-R750, also called Gixxer, was introduced in 2011 and is the longest produced GSX-R 750 series without any major changes. The cycle includes Italian made Brembo brake calipers in front and Nissin calipers in back. It is 20-pounds (9 kilograms) lighter than the model made before 2011 and includes a "back torque limiting" clutch that permits slicker downshifting. It also includes a lightweight Showa Big Piston Fork and a Showa rear shock. The engine power produced on the rear wheel is 127.9-horsepower at 12,600 rpm. Torque at the rear wheel is 55.7 lb-ft (75.5 N-m) at 11,100 rpm.

Originally introduced in 2006, the current Suzuki GSR600 includes a 599 cc 16v inline four engine, fully adjustable rear suspension and street fighter styling.

For owners of Suzuki GSX-R750, GSR750, GSX-S750 and the GSR600, K&N offers the K&N SU-6006 replacement air filter.

The filter is designed to replace the stock air filter element of the Suzuki models and is also designed to boost the engine's horsepower and torque. Since the filter features pleated media, there are more surfaces and larger filtration area assuring long service intervals.

The filter includes multiple layers of cotton gauze that has been treated with a special grade of filter oil. As a result, it can catch and hold dirt particles in place until it comes time to clean the filter. This helps to assure excellent filtration.

K&N is so sure of the quality of the motorcycle air filter it offers a Million Mile Limited Warranty®. That means that K&N promises that the filter will last for up to 10 years or 1,000,000 miles before it needs to be replaced.

In addition, the filter is washable and reusable. To help you be certain that you can use it over and over again, K&N offers air filter cleaner kits that cleanse the filter in a few short steps.

The K&N SU-6006 washable and reusable replacement air filter is designed to fit the following Suzuki motorcycles:

2016 SUZUKI GSXS750 749
2016 SUZUKI GSR750 750
2015 SUZUKI GSXS750Z 749
2015 SUZUKI GSXS750 749
2015 SUZUKI GSR750 750
2014 SUZUKI GSR750 750
2013 SUZUKI GSR750 750
2012 SUZUKI GSR750 750
2011 SUZUKI GSR750 750
2011 SUZUKI GSR600 600
2010 SUZUKI GSR600 600
2009 SUZUKI GSR600 600
2008 SUZUKI GSR600 600
2007 SUZUKI GSR600 600
2006 SUZUKI GSR600 600

You can view all the air filters that K&N makes for these motorcycles at the Air Filters for the Suzuki GSR600, Air Filters for the Suzuki GSR750 and Air Filters for the Suzuki GSX-S750 pages. 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.

K&N Driver Vaughn Gittin Jr. entertains a packed house for Formula D at Evergreen Speedway, in Monroe, Washington.

Gittin Jr. demonstrates what 900 horsepower can do to a set of tires. Good placement of the K&N logo!

After winning Round 4 in New Jersey and making the Final Four in the next round in Canada, knocked out by the eventual winner, things were looking good for Vaughn Gittin Jr. in his quest for the 2016 Formula D Championship.

With more seat time in his new-for-2016 900 horsepower 2016 Ford Mustang RTR, Gittin Jr. went into the Seattle round, at Evergreen Speedway, on August 5 and 6 with a certain degree of confidence for a good result. All started well when he qualified number one, pairing him in the first round with the driver who qualified 32rd.

In the next round Gittin Jr. was paired up against Dean Kearney, a racer from Ireland with 28 European podium finishes and the 2009 Prodrift: European Series Championship to his credit. Kearney is best recognized on track driving his black and orange Dodge Viper.

Gittin Jr. doing his best to fight off Irish driver and former European champion Dean Kearney, but the advantage would go to Kearney on that day in Washington.

If you were the top qualifier for the event as well as season-long points leader, you'd be smiling, too. The next day wouldn't go as well.

The pairing was tighter than anyone had expected. After two runs, first with Gittin Jr. leading, then with him following, the three judges were deadlocked. A call of "One More Time" was made and the two drivers competed in another pair of runs. This time the judges selected Kearney as the winner. Gittin Jr. would advance no further in Seattle. He was credited with a ninth place finish.

In a video posted by Gittin Jr. shortly after the run, he expressed perhaps a little surprise at the result. By being eliminated so early in the competition, he dropped from the top of the year-long championship points standings. In another post he quickly shifted gears to the fact that he's still in third place, 5 points behind second and 10 points behind first, with two more events to go. In his own words "the last two rounds are going to be crazy!" Stay tuned!

All six Skoda Superb engines in 2001-2008 models can be fitted with and benefit from K&N 33-2125 replacement engine air filter.

Between the fall of communism and privatization of Czech Republic industries in the early 1990s and its 2015 global sales mark of more than 1 million cars, the current era Skoda Motor a bona-fide success story. Since 2000 a wholly owned subsidiary of Volkswagen Group, the Skoda range intended to be VW's entry-level cars, but they, and especially the Skoda Superb, have done far better than imagined.

The rectangular, panel-style K&N 33-2125 is constructed of a special cotton gauze that flows more air than the stock paper filter, and is washable and reusable.

An ad campaign launched in 2000 to polish the image of an increasingly attractive line of Skoda passenger vehicles,"It's a Skoda, honest!", worked especially well in the UK, and car shoppers responded. Later, the 2015 Driver Power survey of 46,000 owners, conducted by Auto Express magazine and the Telegraph website, identified their top 100 cars to own and there were three Skodas in the top 10: first, the Yeti; second, the Superb and sixth, the Octavia.

Built in Czech Republic, China, Russia, India, Slovakia, Ukraine, Kazakhstan, and distributed throughout Europe, Australia, India, UK, Russia and China, the first generation 2001-08 Superb, is produced on the long wheel base version of the B5 platform of the VW Passat. It is the top of the line Skoda, and besides being a favorite large family car, it is a preferred choice among limousine and taxi services, and rental fleets.

Utilizing three gasoline and three diesel engines, mounted longitudinally as inVW's Passat, paired with a five- or six-speed manual transmission or a five-speed automatic, the Superb has a wide range of power and gearing for people-moving and grand touring. Its 2006 facelift brought an interior redesign with luxury detailing and a refreshed exterior with new grille, head- and taillights, and mirrors. Recalling the Superb's original 1934 nameplate has a certain provenance in Skoda circles, when it was a luxury model owned by entrepreneurs and royalty adds to the appeal of today's iteration.

Noting that the Superb 2.5 TDI V6 was voted Britain's Towcar of the Year in 2002 and the Skodas in general are still the Czech Republic's leading resale used car, these vehicles are keepers.

If you own a first-generation Superb, you have no doubt been maintaining it on a defined schedule, with oil changes, lubes, and cabin air filter and engine air filter services. Available to Superb owners for some time has been the K&N 33-2125 replacement engine air filter, which is washable and reusable.

Even with its range of different engines, the 2001-2008 Superb shares this same air filter, designed and engineered by K&N especially for these powerplants, and replacing it is an easy job requiring no special tools.

The open-top, panel-style, rectangular cotton gauze filter presents a larger surface area at the intake, and provides increased air flow to the engine. Additionally, the 33-2125 provides excellent protection for the motor. When tested by K&N's in-house laboratory, it worked at 98.73 percent capacity.

The 33-2125 will last up to 50,000 miles between cleanings, depending on driving conditions, but you may inspect and clean it more often. The process is simple and a set of printed instructions accompany each filter. There are also K&N videos available online to walk you through a filter service.

The best way to clean the filter is with K&N's 99-5000 filter care service kit. Spray it with Power Kleen spray; rinse it in clear running water; let it air dry completely, then re-oil it with a few squeezes of the air cleaner oil before returning it to the air box. You can also simply specify the K&N 33-2125 filter and 99-5000 cleaning kit to your mechanic for the next maintenance date and be assured that you've given your Superb the option for a superbly long and healthy life.

Additionally, all K&N engine air filters are warranted for 10 years or 1 million miles, so you won't need to buy a new engine air filter for that vehicle again.

Your Superb deserves an investment in engine protection from K&N. To find a K&N replacement air filter for your specific model, use K&N's online search by vehicle tool. To find an authorized K&N dealer anywhere on the planet, use the K&N dealer search tool.

The K&N 33-2125 replaces these part numbers:
AC Delco A1411C
Audi 058133843
Audi 059133843A
BMC 10201
Fram CA8080
Mann-Hummel C26168
Napa 2295
Purolator A47039
Ryco A1434
Ryco A1618
Skoda 058133843
Wesfil WA5095
Wesfil WA970
WIX 42295

The following Skoda Superb models can be fitted with the K&N 33-2125 replacement air filter:
2008 SKODA SUPERB 2.8L V6
2008 SKODA SUPERB 2.5L V6 Diesel
2008 SKODA SUPERB 2.0L L4 - to 6/08
2008 SKODA SUPERB 2.0L L4 Diesel - to 6/08
2008 SKODA SUPERB 1.9L L4 Diesel - to 6/08
2008 SKODA SUPERB 1.8L L4 - to 6/08
2007 SKODA SUPERB 2.8L V6
2007 SKODA SUPERB 2.5L V6 Diesel
2007 SKODA SUPERB 2.0L L4
2007 SKODA SUPERB 2.0L L4 Diesel
2007 SKODA SUPERB 1.9L L4 Diesel
2007 SKODA SUPERB 1.8L L4
2006 SKODA SUPERB 2.8L V6
2006 SKODA SUPERB 2.5L V6 Diesel
2006 SKODA SUPERB 2.0L L4
2006 SKODA SUPERB 2.0L L4 Diesel
2006 SKODA SUPERB 1.9L L4 Diesel
2006 SKODA SUPERB 1.8L L4
2005 SKODA SUPERB 2.8L V6
2005 SKODA SUPERB 2.5L V6 Diesel
2005 SKODA SUPERB 2.0L L4
2005 SKODA SUPERB 2.0L L4 Diesel
2005 SKODA SUPERB 1.9L L4 Diesel
2005 SKODA SUPERB 1.8L L4
2004 SKODA SUPERB 2.8L V6
2004 SKODA SUPERB 2.5L V6 Diesel
2004 SKODA SUPERB 2.0L L4
2004 SKODA SUPERB 1.9L L4 Diesel - TDi
2004 SKODA SUPERB 1.8L L4
2003 SKODA SUPERB 2.8L V6
2003 SKODA SUPERB 2.5L V6 Diesel
2003 SKODA SUPERB 2.0L L4
2003 SKODA SUPERB 1.9L L4 Diesel - TDi
2003 SKODA SUPERB 1.8L L4
2002 SKODA SUPERB 2.8L V6
2002 SKODA SUPERB 2.5L V6 Diesel
2002 SKODA SUPERB 2.0L L4
2002 SKODA SUPERB 1.9L L4 Diesel - TDi
2002 SKODA SUPERB 1.8L L4
2001 SKODA SUPERB 2.0L L4
2001 SKODA SUPERB 1.9L L4 Diesel - TDi
2001 SKODA SUPERB 1.8L L4

You can view all the air filters that K&N makes for these vehicles at the Air Filters for the Skoda Superb page. 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.

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.

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.

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

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