K&N Replacement Air Filters

  • Designed to Increase Horsepower
  • Easy to Install Drop-in Design
  • Reusable Air Filter Media
  • Million Mile Limited Warranty®
  • Lasts up to 50,000 Miles Between Servicing

Automotive Air Filters

K&N automotive replacement air filters are designed to add horsepower and acceleration to your car or truck while providing exceptional engine protection. K&N replacement air filters are simple to install and backed by the K&N Million Mile Limited Warranty. Not only are K&N air filters washable and reusable, they can last up to 50,000 miles between servicing, depending on driving conditions.

K&N Motorcycle Air Filters

K&N Air Filter History

K&N Filters has been designing and manufacturing performance air filters since 1969. We have designed and manufactured over 2400 high flow air filters to fit most of the latest passenger vehicles and over 500 performance air intakes for automotive and motorcycle owners interested in increasing vehicle horsepower and acceleration. K&N also makes thousands of racing and specialty type air filters and we are the #1 Filter in NASCAR®.

K&N automotive OE (original equipment) replacement air filters generally add 1 to 4 horsepower to your car or truck, due to the unique characteristics of our filter media. K&N air filter media was originally developed in the dust, sweat and tears of desert motocross racing. K&N air filters were created for an environment that required maximum horsepower and acceleration while protecting the engine from the dirt and dust of off-road racing. This resulted in an air filter designed to achieve high, virtually unrestricted air flow while protecting your engine for the life of your vehicle. K&N washable and reusable air filters are made up of four to six layers of cotton gauze layered between two sheets of epoxy-coated wire mesh. The media is pleated and oiled to enhance overall filtration and performance.

Air Filter Filtration & Engine Protection

K&N air filters offer an optimal blend of high air flow, filtration efficiency, durability and dust capacity. K&N high flow filter media has been tested in our own in-house laboratories and by independent labs using the ISO5011 air filtration standard developed by the Society of Automotive Engineers. Our goal at K&N is to design air filters with the most possible airflow while providing guaranteed engine protection.

K&N Air Filter Microfibers

K&N Air Filter Oil

A K&N air filter is designed with four to six layers of cotton gauze media sandwiched between two aluminum wire screens. The cotton media is then treated with a specially formulated grade of filter oil that causes tackiness throughout the cotton's microscopic strands. The cotton in a K&N air filter allows high volumes of airflow, and when combined with the tackiness of the filter oil creates an efficient filtering media that ensures engine protection.

Carl and his million mile Chevy truck with K&N Air Filter installed.

K&N Air Filter Testing

K&N is dedicated to providing quality air filter products that meet or exceed your high performance and high filtration demands. K&N uses independent testing labs in addition to conducting tests using our own state-of-the-art in-house testing laboratory. The quality of K&N air filters can also be seen outside the laboratory. Carl Judice, of New Iberia, Louisiana, drove more than one million miles with a single K&N air filter installed in his three-quarter ton Chevy pickup. Carl points out that he has never had to rebuild the engine or remove the cylinder head from his trusty pickup truck. Customer satisfaction along with real-world testing doesn't get any better than that.

Lifetime Reusable Air Filters

K&N washable and reusable air filters are handmade in the USA and United Kingdom using only the finest materials. It is almost impossible to wash your K&N air filter or air cleaner too much. K&N washed and re-oiled one K&N air filter more than 100 times, inside our testing laboratory, and it still performs up to specification. K&N air filters can go up to 50,000 miles between cleaning, depending on your driving conditions. To clean and re-oil your K&N air filter, use a K&N Air Filter Cleaning Kit and use the easy to follow instructions.

Air Filter Fuel Economy

Fuel economy testing and mileage claims are not as cut and dry as they may seem. The EPA's website states, "EPA's fuel economy estimates are designed to allow consumers to comparison shop. Your fuel economy will almost certainly vary from EPA's fuel economy rating. This is based on a number of factors, such as weather, road conditions, your driving and maintenance habits, and your use of air conditioning." Many exaggerated claims are found in the marketplace by automotive products claiming to improve vehicle gas mileage. K&N does not make any general fuel economy claims. We simply encourage you to try our air filter products for yourself.

K&N Million Mile Limited Warranty

K&N Million Mile Limited Warranty®

K&N warrants its street vehicle OE (original equipment) replacement air filters for one million miles. If used properly and found to be defective, return your filter with the receipt from purchase and K&N will replace it free of charge. Visit the K&N Million Mile Limited Warranty page for more details.

K&N Panel Air Filter

K&N Consumer Protection

The K&N Consumer Protection Plan goes a step further than the K&N Million Mile Limited Warranty. At times, the performance aftermarket has been plagued by automotive manufacturers and auto dealers that may attempt to discourage you from modifying your vehicle. They would prefer that you buy OE parts and not customize your car or truck and have even voided their own manufacturer's warranty due to vehicle modifications. K&N and the Magnuson-Moss Warranty Act protect consumers from such denied warranty claims. When you buy a K&N OE replacement air filter or air intake system you can be confident your vehicle's warranty will remain in effect. If you encounter a dealership that wants to void your warranty because of one of our products, K&N will resolve the issue so you won't have to. We believe K&N makes The World's Best Air Filter and we stand behind that claim 100 percent.

Consumer Protection Pledge

K&N pledges to our customers that they will not be taken advantage of and charged for a repair due to a dealership warranty denial blamed on the presence of a K&N product.

K&N 33 Series Automotive FiltersK&N 33 Series Panel Automotive Filters
A K&N 33 series OE replacement air filter is designed to increase horsepower and acceleration. These washable and reusable panel air filters are easy to install because they fit directly into the existing vehicle factory air box.
K&N AC, AL, and AT Series Air FilterK&N AC, AL, and AT Series Air Filters
K&N AC Series performance air filters are designed for Arctic Cat ATVs. The K&N AL Series air filter is developed for the Aprilia motorcycle. K&N AT Series filters are designed for ATK motorcycles. K&N washable and reusable AC, AL and AT Series air filters are application specific and fit right into the OEM air box.
K&N B Series Performance Air FilterK&N BA, BD, BM & BU Series Air Filters for Bajaj Pulsar, BMW and Buell Motorcycle
K&N makes the BA, BD, BM and BU Series reusable air filters for Baja Pulsar, BMW and Buell motorcycles. They are designed to improve horsepower and torque and easily replace your bike's stock air filter element.
K&N Ducati Motorcycle Replacement Air FilterK&N DU Series Ducati Motorcycle Air Filters
A K&N Ducati motorcycle drop-in air filter is washable, reusable and easy to install. K&N's DU Series filters are designed to add performance and power while protecting your engine.
K&N Round Automotive Air FilterK&N E Series Round Automotive Air Filters
K&N E Series round automotive air filters are designed to replace your restricted factory air filter for additional horsepower and performance. These filters are washable, reusable and last up to 50,000 miles before cleaning is required, depending on your driving conditions.
K&N Honda Motorcycle Washable Air FilterK&N HA Series Honda Motorcycle Air Filters
Washable and reusable HA Series air filters from K&N are application specific and fit directly into the OEM air box of your Honda motorcycle. A K&N performance air filter is a simple way to add performance to your bike.
K&N Harley Davidson® Motorcycle Air FilterK&N HD Series Harley Davidson® Motorcycle Air Filters
K&N manufactures the HD Series air filter for Harley Davidson® motorcycles. These reusable filters are designed to add horsepower and torque while at the same time providing excellent filtration and engine protection.
K&N Kawasaki Motorcycle Cotton Air FilterK&N KA Series Kawasaki Motorcycle Air Filters
The KA Series replacement air filter from K&N is designed to improve the performance of Kawasaki motorcycles. These cotton air filters are pleated to provide a large filtration area and long service intervals.
K&N Suzuki Motorcycle Replacement Air FilterK&N SU Series Suzuki Motorcycle Air Filters
K&N's high-flow filters for Suzuki motorcycles offer virtually unrestricted air-flow to keep your engine breathing strong. The K&N SU Series air filter is reusable and easy to install.
K&N Yamaha Motorcycle Performance Air FilterK&N YA Series Yamaha Motorcycle and ATV Air Filters
K&N YA Series performance filters are designed to increase horsepower and torque for Yamaha motorcycles while offering excellent filtration. The K&N OE replacement air filter is easy to install and can be used over and over again.