Latest News

K&N air cleaner assemblies are designed with the racer or classic car enthusiast in mind, and provide superior performance, excellent engine protection, as well as impressive styling

K&N and racing go way back, all the way to the company's inception in 1969. Ken Johnson and Norm McDonald, the founders of K&N, identified a need for better-performing air filters for their racing motorcycles and invented the high-flow cotton air filter. Their revolutionary air filter design was put to the test in off-road motorcycle racing and proved to be a durable performance product. Over the last 45+ years, K&N air filters have been utilized in a wide variety of racing applications from NASCAR and NHRA drag racing to the Lucas Oil Off-Road Series and the Baja 1000. K&N air filters have consistently been proven to deliver outstanding airflow, filtration efficiency, and performance.

Nearly everyone loves a classic car and with them comes the most classic air filter design housed in a round air cleaners & assemblies sitting atop a carburetor. Whether for a classic, or a race car, if it needs a round air filter and air cleaner, K&N has air cleaners that will look great under the hood and provide high airflow. Perhaps the most common are the 14" and 16" air cleaner assemblies. These assemblies come in a variety of heights and baseplate configurations to fit popular 4-barrel carburetors or similar throttle body setups. K&N 14" and 16" air cleaners are available with filter element heights ranging from 2 5/16" up to 6" to accommodate different hood clearance needs as well as airflow requirements. K&N 14" or 16" air cleaners are available in either 5-1/8" or 7-5/16" neck flange diameters to fit standard and Holly Dominator-sized carburetors.

The 14-inch round, by 3-inch high air cleaner assembly was the go-to performance air cleaner choice for carbureted race car, hot rod, muscle car and pickup truck owners for years

Another feature of K&N's 14" air cleaner assemblies is that they're available with different drop or raised base plates to meet additional fitment and performance requirements. 14" assemblies with a 5-1/8" neck flange diameter can be ordered with a 1-1/4" or 7/8" drop base. A drop base K&N air cleaner effectively lowers the bottom edge of the filter element below the carburetor flange to alleviate hood clearance issues. 14" K&N air cleaners with the standard 5-1/8" neck are also available with a raised base plate.

K&N 14" air cleaners for the 7-5/16" Holly Dominator sized neck flange come with a 3/4" velocity stack built into the base plate to help streamline and smooth airflow into the carburetor to further increase performance. K&N 16" air cleaner assemblies come in a 7-5/16" neck flange diameter and are capable of flowing over 1000 CFM. If you have a Dominator-sized carburetor and serious performance is your number one priority, the K&N 16" air cleaner assembly is for you. Browse the list of K&N Fourteen & Sixteen Inch Custom Air Cleaner Assemblies to find the perfect air cleaner assembly.

K&N also offers round air cleaner assemblies in 11" diameters. 11" diameter K&N air cleaners are offered in 2 5/8" and 5 1/8" neck flange sizes for applications where space is at a premium, but performance cannot be sacrificed. Additionally, K&N 11" air cleaners are offered with 7-5/16" neck flange with filter element heights ranging from 3-1/2" to 6", making them ready to flow the air required by thirsty Holly Dominator carburetors. Browse K&N Eleven Inch Custom Air Cleaner Assemblies to view all the available K&N 11" air cleaners.

When space really is a problem, look no further than the K&N 9" air cleaner assemblies. Available in 5 different flange sizes and various heights, these 9" air cleaners are ideal for dual carb setups. They include stainless steel top and base plates as well as an optional tall velocity stack base plate. These tall velocity stack base plates position the air filter 5" above the carburetor to draw cooler air into the engine and increase air velocity. Engines equipped with these K&N Tall Velocity Stack Air Filter assemblies can produce more horsepower, with proper carburetor calibration, than those with no air cleaner assembly at all. Note, these assemblies are not U.S. Coast Guard approved as marine flame arrestors.

Because serious engines require serious airflow, K&N offers X-Stream Airflow Tops which replace the traditional air cleaner top plate with K&N high-flow filter media

And then we have the smallest of the grou - the K&N 7" air cleaner assemblies. These air cleaner assemblies are ideal for show car applications, but may not flow enough air for optimum performance. See K&N's air filter facts for information on proper air filter sizing. Because serious engines require serious airflow, K&N also offers X-Stream^® Airflow Tops. The X-Stream airflow tops and X-Stream air cleaner assemblies replace the traditional top plate with K&N high-flow filter media. More filtration surface area will provide additional airflow, which can translate to more power. Complete air cleaner assemblies can be ordered in 9", 11", 14" and 16" sizes in various colors with the X-Stream top. Search through the K&N XStream Air Flow Assemblies, Filters, and Filter Tops to find the right X-Stream Airflow air cleaner.

The revolutionary K&N Flow Control air cleaner makes use of a custom lid and base plate to provide smooth, laminar airflow into standard 5-1/8" or 7-5/16" neck carburetors

Another option for maximum airflow requirements is the K&N Flow Control System. This revolutionary air cleaner assembly makes use of a custom lid and base plate to provide smooth, laminar airflow into the carburetor. Available for 2- and 4-barrel Holly carburetors, both standard and Dominator-sized as well as Rochester carburetors, this is the most advanced air filter assembly K&N offers for carbureted applications. The Flow Control System air cleaner assemblies have been dyno-proven to deliver impressive power gains and are capable of flowing up to 1,200 CFM.

While a 4-barrel carburetor is the performance standard, K&N hasn't forgotten about smaller one- or two-barrel carburetors. Whether an air cleaner is needed for Weber, SU, Solex, Mikuni, Holly, Stromberg, Dellorto or other carburetors, K&N most likely has an air cleaner that will get the job done. Take a look at K&N's extensive offering of Custom Air Filters for Single or Two Barrel Carburetors. These assemblies come with a K&N washable and reusable high-performance air filter, chrome top and bottom plates, as well as all the gaskets, nuts, and vent tubes necessary for installation.

While a 4-barrel carburetor is the performance standard, K&N hasn't forgotten about smaller one- or two-barrel carburetors

Looking for an air cleaner assembly with a bit more flair or period-correct aesthetic? Check K&N's Custom 66 Air Cleaner Assemblies and Nostalgia Air Filter Cleaners. These air cleaner offerings are available for dual-quad, Tri-Power setups and more. Like all of the above-mentioned K&N air cleaners, they come with a high-flow washable K&N air filter and are available with a variety of custom-designed top plates. Performance won't come second to style with one of these air cleaner assemblies from K&N.

All of K&N's custom air cleaners are designed to increase horsepower and acceleration with proper carburetor calibration. K&N air cleaners come with a washable and reusable, high performance K&N air filter. Approximately every 50,000 miles, under normal highway driving conditions, remove the air filter and service it following K&N's step-by-step instructions. K&N backs its custom air cleaners with a One-Year/Unlimited Mileage Limited Warranty. These air cleaner assemblies are not intended for use on emission-controlled street or highway vehicles.

Whether your vehicle dominates the race track, owns the showroom floor, or is a smog-exempt classic used to cruise the boulevard, K&N has a custom air cleaner assembly that will help it breathe easy with plenty of clean air and style. K&N air cleaners have been refined over 45+ years of racing and will deliver superior airflow and superior performance both on the track and on the street. Find a K&N custom air cleaner assembly on KNFilters.com.

The K&N 57-5300 air intake system includes a K&N air filter and free-flowing polyethylene tube.

Related to the Hyundai Santa Fe, Sonata, Trajet, and Kia Sedona, the Optima rests on a Hyundai-Kia Y4 platform and features a front engine and front wheel-drive configuration.

Three engines were available to power the first generation model, which was available from 2000 through 2005. A 2.4-liter Sirius II I4 that produced 149-bhp at 6000 rpm and 159-lb-ft (212 N-m) of torque at 4500 rpm, a 2.5-liter Delta V6 that generated 170-bhp at 6000 rpm and 169-lb-ft (229 N-m) of torque at 4000 rpm, and a 2.7-liter Delta V6 that delivered 170-bhp at 6,000 rpm and 181-lb-ft (245 N-m) of torque at 4000 rpm.

The second-generation (2005-2010) Kia Optima was called the Kia Magentis in Europe, Canada, Australia, Brazil, and Singapore; the Kia Lotze in South Korea. Seven engines were available to power the vehicle, ranging from a 2.0-liter gas to a 2.7-liter gas powered engine.

The third-generation (2010-2015) Kia Optima was also known as the Kia K5 in South Korea, China, and Indonesia and the Kia Optima K5 in Malaysia.

The first-generation Hyundai Sonata was introduced in 1985 and ran to 1987. It was also known as the Hyundai Stellar II in Canada.

K&N offers the 57-5300 air intake system to protect and boost the performance of the engine of the 2013 Kia Optima and the Hyundai Sonata.

The air intake system offers an estimated gain of 4.82-horsepower at 5588 rpm. Designed to replace the factory restrictive air filter and air intake tubing and retain the factory air box, the system includes a free-flowing high-density polyethylene tube, a K&N 33-2448 washable and reusable replacement air filter, six stainless steel clamps, and adaptors that connect the system to the engine.

The air intake replaces the air filter and entire air path to the engine, minimizing air path restriction. The polyethylene tube of the system is aerodynamically engineered to help the engine receive more air than the factory system. The tube is rotationally molded to its precise shape so that it can reduce turbulence and accelerate airflow into the engine.

The K&N 57-5300 replaces the factory air filter and air intake to improve airflow to the engine.

The air filter is recommended to be cleaned every 50,000 miles, depending on driving conditions. It can be washed and recharged using the 99-5000 K&N air filter cleaning kit so that it can be reused over and over again. In fact, this may be the last air filter you will ever buy for this vehicle.

K&N is so sure of the quality of its air filter it backs it with a 10-year/Million Mile Limited Warranty. The warranty promises that the filter will perform for up to 10 years or 1,000,000 million miles without requiring replacement.

The intake can be easily installed in about 90 minutes using factory holes and mounting points with common hand tools. It is compatible with original equipment manufacturer computer systems.

The K&N 57-5300 performance intake kit is designed and engineered for the following vehicle applications:

2013 KIA OPTIMA 2.4L L4 Fuel Injection - All Models
2013 HYUNDAI SONATA 2.4L L4 Fuel Injection - All Models

Jonathon Brothers' Ford F-150 that debuted at the 2016 SEMA show

One such person is Jonathon Brothers, Regional Sales Manager for Metra Electronics, a company that manufactures products for the 12-volt industry. Brothers travels to shops in Texas, Oklahoma, and Arkansas selling Metra products.

“I visit car audio stores, truck accessory stores, automotive performance dealers, and marine and powersports stores. I show off new innovative products and provide dealer support and training,” he explained.

A Metra Electronics motorized actuator raises and lowers the Undercover Ridgelander bed cover

Brothers came up with the idea of creating a demonstration vehicle that showcases products from different companies that don’t compete with one another and target the same stores and consumers. Having been in the industry for more than 12 years, he is familiar with these companies and the products they sell.

“We all have a similar dealer base, but we don’t compete with each other as far as products are concerned,” said Brothers. “So I thought of coming up with a vehicle that showcases everyone’s products to help each other out.”

Brothers brainstormed the idea, selected a few companies to work with as well as some of the products they offer and he decided that a 2016 Ford F-150 pickup truck would serve as the perfect platform.

The rear bodyguard bumper is home to an array of Heise LED lights and a massive Monster hook

Brothers then used the rendering to sell the concept to other manufacturers who he thought would want to participate in the project. It wasn’t long before he had commitments from Metra, K&N Engineering, Brenthel Industries, Sony, Magnaflow, Bodyguard Bumpers, Heise Lighting, M-Racks, Fiber Tech Performance, Undercover, Rhino Racks, Monster Hooks, Addictive Desert Designs, DropStar Wheels and Hercules Tires.

Brenthel contributed a Baja suspension kit, a pre-runner kit with a 4.5-inch lift that provides 12-inches of wheel travel and widens the stance of the truck 3-inches on each side. King 3.0 coilovers and upper and lower pre-runner control arms were used for the front set up. The rear suspension includes Deaver leaf springs and King 2.5 piggyback shocks.

K&N provided a 71-2591 Blackhawk induction air intake system that includes a free-flowing, mandrel-bent aluminum tube, a washable and reusable air filter that has an oil-free synthetic filter media that can be used for up to 100,000 miles before cleaning is necessary, depending on driving conditions, and a heat shield that blocks hot air from the engine compartment from getting into the intake. The intake system offers an estimated 11.39-horsepower boost on the F-150 EcoBoost engine.

The K&N 71-2591 Blackhawk air intake system offers an estimated 11.39-horsepower to the F-150.

Heise LED lighting 30-inch blackout series light bar, cube fog lights, and spotlights, and flush mount cubes that all fit into Bodyguard front and rear bumpers help to light the way. In addition, a Heise 50-inch LED blackout series light bar for the M-Racks stealth roof rack and four LED single row lights for the four corners of the roof and a 40-inch Slim line on the rear ensure that Jon is never left in the dark. Metra also supplied their newest Turbo Touch installation kit for a Sony 6.4-inch Media Receiver with CarPlay.

Just like the rear bumper, the front is filled with Heise lights and Monster Hook shackles

Monster Hooks front Reaper forged shackles and rear mini shackles attach to the Bodyguard bumpers, while Addictive Desert Designs Baja XTR fenders and bedsides offer added wheel clearance.

Speaking of the wheel and tire package, Jon had a set of DropStar wheels wrapped in Hercules Terra Trac M/T tires from ATD wheels.

Extreme Off-Road in Katy, Texas, was responsible for the majority of the build. Brothers noted that he and six employees of Extreme Off-Road worked for one month straight on the vehicle after hours from 6 p.m. until 3 a.m. some nights to have things ready in time for the SEMA show.

While this may be Jon's daily driver, he is still confident in the products to get a little wild

Brothers, who lives in Houston, Texas, has control of the vehicle. In fact, it is his daily driver as well as his business vehicle.

The truck was featured in DUB Magazine’s LFTDxLVLD booth outside the South Hall at the 2016 SEMA show. It will be exhibited at many Texas and surrounding states’ events including the Austin Texas Heatwave Show, DUB Show Tour, the Keystone Big Show, Meyer Distributing Show, and the Lifted Truck Nationals. It will also appear in LFTDxLVLD magazine.

The truck has been built for off-road driving, but also for practical everyday use visiting dealers.

“I’ve taken it out and have had a lot of fun with it in the desert during our photo shoots,” Brothers concluded.

Dale Martin and Mountain Motion Media snapped the pictures.

Andrew Carlson battles the off-road track at a TORC series event.

“We’re thrilled to be partnering with K&N Filters,” said Carlson Moto Team Owner and Manager Chris Carlson. “They have an impressive history as a market leader in filtration and we’ve been using their products for many years with great success.”

“We continually look for partners that can help us get to the next level,” added Taylor Carlson Schroer, Marketing Manager for Carlson Moto. “We have been a lifetime user of K&N products. Their legacy in motorsports and racing ties into what we do on a day-to-day basis. We’ve seen them at races and it feels like a great fit. We’re really excited to represent K&N. We think we have a core advantage being a year round team. The demographics of both series is very similar and we think we can introduce more snowcross enthusiasts to K&N products.”

Carlson Moto is a family owned and operated racing team based in Elk River, Minnesota, that has 10 members including husband and wife team owners Chris and Deb Carlson, daughter Taylor and son Andrew, and Ryan Springer, Derek Ellis, Haley Pratt, Jayme Cheney, Jesse Heise, Race Stamper, and Josh Groen.

Andrew and Ryan are snocross pro open riders and Andrew also is a TORC off road Pro Light driver. Derek is the Snocross Program Manager, Haley is the Marketing Coordinator, Jayme is the Snocross Crew Chief, Jesse is the Off-Road Program Manager, and Josh and Race are the Team Mechanics. As Marketing Manager Taylor is also involved in promoting the team on social media.

Andrew racing an ISOC national snocross series event on a Polaris FXR snowmobile.

2016 has proven to be a productive year for Carlson Moto. Andrew achieved the team’s first win in The Off-Road Championship series at ERX Motor Park in Elk River, Minnesota, the Carlson’s hometown track, in July. He also achieved podium finishes in The Off-Road Championship series in Crandon, Wisconsin in June and in Charlotte in August and at the inaugural Red Bull Snow Boundaries race at Elk River, Minnesota in February.

Besides K&N, the team’s other sponsors include:

• Polaris

• AMSOIL

• Sportech

• Walker Evans Racing (Snocross)

• FOX (Off-Road)

• FXR

• Atturo Tires

• CDI Custom Curb Adapters

• Mnbolt

• Covestro

• Woody’s

• Doga

• Primex Plastic Corporation

• C&A Pro Skis

• Rox Speed FX

• NGK Spark Plugs

• Starting Line Products

The Carlson family and team use a number of K&N products on various vehicles including:

Race Hauler

• HP-8002 oil filter

• 38-2018S air filter

RV

• HP-8003 oil filter

Andrew’s Truck

• 63-2592 air intake

• PS-2011 oil filter

Andrew’s Polaris RZR

• PL-1014 air filter

Race Trucks

• 60-1260 air cleaner

• 61-4010 flow control air cleaner

• E-3031R air filter

• 25-5600 air filter foam wrap

• E-3760 air filter

• E-3750PK air filter

• 22-1440PK air filter wrap

• 66-1401 X-Stream top filter

• 85-6840 carbon fiber air filter top plate

• HP-3001 oil filter

• HP-5001 oil filter

• 99-0704 sealing grease

• 99-0551 cleaning oil

Shop Truck/Shop UTVs/Employee Vehicles

• PS-1017 oil filter

• E-1998 air filter

• PL-5712 air filter

• KN-198 oil filter

• PS-3003 oil filter

• 33-2387 air filter

• 33-2233 air filter

• PS-2009 oil filter

• 33-2466 air filter

The RK-3944 intake is available in chrome (shown) or black (RK-3944B)

The horsepower gains are significant whether you ride an 883cc or 1200cc Sportster. K&N’s dynamometer testing has verified an estimated gain of well over 4 horsepower on a 2014 XL883. On a 2009 1200 Sportster, the estimated gain was over 8.5 horsepower with the RK-3944. Of course, horsepower enhancement will vary depending on the individual bike, but those are healthy gains for an affordable and easy to install system. The intake mounts via a custom aluminum backing plate that bolts directly to the throttle body.

The RK-3944 compliments the overall look of any Sportster

Of course, K&N filters also offer up extremely effective filtration. The oiled, cotton gauze filter media is a proven performer in trapping and holding airborne dirt, dust, and contaminants. The added bonus is that the filter element is fully washable and reusable putting an end to the need for purchasing and trashing countless paper filters. When cleaning is needed, use the K&N 99-5000 filter cleaning kit to conveniently restore air flow efficiency.

Everything that is needed for installation is included in the box

If your Harley Sportster is listed below, the RK-3944 or RK-3944B are for you.

2014 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2014 HARLEY DAVIDSON XL883L SUPERLOW 54 CI - All Models
2013 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2013 HARLEY DAVIDSON XL883L SUPERLOW 54 CI - All Models
2013 HARLEY DAVIDSON XL1200X FORTY-EIGHT 74 CI - All Models
2013 HARLEY DAVIDSON XL1200V SEVENTY-TWO 74 CI - All Models
2013 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2012 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2012 HARLEY DAVIDSON XL883L SUPERLOW 54 CI - All Models
2012 HARLEY DAVIDSON XL1200X FORTY-EIGHT 74 CI - All Models
2012 HARLEY DAVIDSON XL1200V SEVENTY-TWO 74 CI - All Models
2012 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2012 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2011 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2011 HARLEY DAVIDSON XL883L SUPERLOW 54 CI - All Models
2011 HARLEY DAVIDSON XL1200X FORTY-EIGHT 74 CI - All Models
2011 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2011 HARLEY DAVIDSON XL1200L SPORTSTER LOW 74 CI - All Models
2011 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2010 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2010 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2010 HARLEY DAVIDSON XL1200X FORTY-EIGHT 74 CI - All Models
2010 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2010 HARLEY DAVIDSON XL1200L SPORTSTER LOW 74 CI - All Models
2010 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2009 HARLEY DAVIDSON XL883N IRON 54 CI - All Models
2009 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2009 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2009 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2009 HARLEY DAVIDSON XL1200L SPORTSTER LOW 74 CI - All Models
2009 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2008 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2008 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2008 HARLEY DAVIDSON XL883 SPORTSTER 54 CI - All Models
2008 HARLEY DAVIDSON XL1200R SPORTSTER ROADSTER 74 CI - All Models
2008 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2008 HARLEY DAVIDSON XL1200L SPORTSTER LOW 74 CI - All Models
2008 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2007 HARLEY DAVIDSON XL883R SPORTSTER 54 CI - All Models
2007 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2007 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2007 HARLEY DAVIDSON XL883 SPORTSTER 54 CI - All Models
2007 HARLEY DAVIDSON XL1200R SPORTSTER ROADSTER 74 CI - All Models
2007 HARLEY DAVIDSON XL1200N SPORTSTER NIGHTSTER 74 CI - All Models
2007 HARLEY DAVIDSON XL1200L SPORTSTER LOW 74 CI - All Models
2007 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2006 HARLEY DAVIDSON XL883R SPORTSTER 54 CI - All Models
2006 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2006 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2006 HARLEY DAVIDSON XL883 SPORTSTER 54 CI - All Models
2006 HARLEY DAVIDSON XL1200R SPORTSTER ROADSTER 74 CI - All Models
2006 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2005 HARLEY DAVIDSON XL883L SPORTSTER LOW 54 CI - All Models
2005 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2005 HARLEY DAVIDSON XL1200R SPORTSTER ROADSTER 74 CI - All Models
2005 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models
2004 HARLEY DAVIDSON XL883C SPORTSTER CUSTOM 54 CI - All Models
2004 HARLEY DAVIDSON XL883 SPORTSTER 54 CI - All Models
2004 HARLEY DAVIDSON XL1200R SPORTSTER ROADSTER 74 CI - All Models
2004 HARLEY DAVIDSON XL1200C SPORTSTER CUSTOM 74 CI - All Models