large cone air filter


There’s a reason top racers trust K&N® to protect their trophy trucks in the Baja 1000, premium racecars in 24 Hours of Le Mans, million-dollar NASCAR engines, and high-horsepower dragsters: K&N® air filters let airflow in, and keep dirt out. Designed for the racetrack—made for your vehicle. Layered, oiled cotton media provides up to 50% more airflow than traditional paper air filters, which can provide an increase in horsepower. The durable filter frame and media is designed to last for the entire lifespan of your vehicle, and is protected by a 10-Year/Million Mile Limited Warranty.

Engineered to deliver performance
Extensively Tested
Built for Racers, by racers

Heightened Horsepower

We’ve been leading the industry in washable filtration for over 50 years, delivering peak performance and protection to millions of vehicles across the globe.

spraying filter oil on car filter


Unlike disposable filters which must be frequently replaced, K&N® High-Flow Air Filters™ are washable, reusable, and engineered to last for the life of your vehicle. Feel confident in your purchase with a 10-Year/Million Mile Limited Warranty.

dodge charger on dyno


High-flow cotton media is designed to allow up to 50% more airflow than traditional paper filters—and greater airflow can result in increased horsepower and torque. K&N® air filters are tested on a SuperFlow flow bench to ensure increased airflow over a stock filter. View testing data for many K&N filters on individual product pages.

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SUV on sand dune


K&N’s state-of-the-art filter features thousands of microscopic cotton fibers, and an innovative design of layered, oiled cotton media helps to capture dirt and shield your engine from contaminants. Each filter design is tested in an ISO 5011 laboratory to ensure excellent filtration efficiency for outstanding engine protection.

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Over 100 million disposable air filters and their packaging waste end up in landfills each year. Choosing a washable, reusable product that lasts for the lifespan of your vehicle helps to reduce unnecessary waste.

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installing a K&N engine air filter


Engineered to fit easily into your factory air box as easily as any other air filter. Typically installs in less than five minutes with no tools necessary.

K&N cleaning kits


Use specially formulated filter cleaner to help restore your filter’s particle capturing capability quickly and easily.

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K&N is the home of the original red oiled air filter. In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N), developed a ground-breaking new idea for an oiled air filter. Five decades later, K&N® is still innovating industry-leading filtration technology, and offers outstanding protection for everything from top-fuel dragsters to commuter vehicles across the globe. Thank you for helping us reach 50 years in business!






Typical disposable paper air filters function on a size-dependent basis, in which dirt particles that are larger than the openings in the filter media are blocked, while particles that are smaller than the openings can pass through. Most disposable paper filters create more airflow restriction than K&N filters, as the openings in the filter media have to be tiny in order to filter efficiently, which can reduce airflow.

K&N® High-Flow Air Filters™ utilize depth loading, in which multiple layers of pleated cotton fibers provide particle retention on many levels. However, while most typical paper or foam filters would experience a large reduction in airflow when designed for a dramatic increase in efficiency, High-Flow Air Filters™ are specifically engineered to capture dirt while still allowing a high volume of airflow to pass through.

Laboratory tests utilizing ISO 5011 test protocols demonstrate that most K&N® air filters achieve overall filtration efficiency in the range of 97% to 99%. (The ability of an air filter to protect an engine is generally measured in accordance with laboratory testing procedure ISO 5011.) K&N® air filter designs are subjected to ISO 5011 testing involving coarse and fine test dust, and the test results are measured by a specific air filtration efficiency number. K&N® filters are designed to provide exceptional airflow while simultaneously targeting an overall filtration efficiency that meets or exceeds OEM standards.

No. Most disposable filters are "barrier filters,” which act as a physical barrier to dust particles. Once a dust particle covers a pore in the media, air can no longer flow through that space. K&N® replacement air filters are designed to absorb dirt and dust particles instead of physically blocking them, allowing the pores in the material to continue flowing air.

K&N® does not complete vehicle performance tests (dynamometer tests) for every application for which a replacement air filter is offered. Airflow testing is performed on every air filter design in order to verify that the K&N filter provides high airflow. However, other components of the vehicle's air intake system (like the air filter housing or tubing) can create air restriction and limit horsepower. The design of these parts varies among different vehicles and manufacturers, so there is no way to accurately estimate a specific horsepower gain from replacing an air filter alone.

Filter efficiency is only one element of filter performance. Capacity, restriction, and service life should also be taken into consideration when evaluating a filter. These other factors reflect the amount of dirt the filter can hold, how easily air can flow through the filter, and how long the filter can be used before servicing. A brick wall, for instance, would be likely to filter 100% of particulate matter—but would of course provide very limited airflow! K&N® filters are designed to strike a desirable balance between efficiency, capacity, durability, and airflow.

K&N® High-Flow Air Filters™ are designed to last for the life of your vehicle. If you assume an engine life of 175,000 miles—and replace your disposable air filter every 15,000 miles—only one K&N air filter will be used during the same period in which eleven disposable air filters are discarded.

While the oiled K&N® High-Flow Air Filter™ continues to be the most popular filter type among K&N® filter products, K&N also offers non-oiled synthetic DRYFLOW® air filters. The DRYFLOW® filter media is composed of two-layered synthetic material, which—much like High-Flow Air Filter™ media—provides depth loading properties. DRYFLOW® filter media provides slightly less airflow than High-Flow Air Filter™ media, though it is still designed to strike a desirable balance between airflow and efficiency, provide a high level of contaminant capture, and outperform typical disposable paper air filters in airflow. Because they do not have to be re-oiled, servicing DRYFLOW® air filters is typically a quick and easy process.

No. In the United States, in order for the manufacturer of a warranted product to void or deny warranty coverage of a repair due to the use of an aftermarket part, the manufacturer must provide proof that the aftermarket part is the cause of the necessary repair. These rights are protected under the Consumer Products Warranty Act of 1975 (also referred to as the Magnuson-Moss Warranty Act).

The service interval for a drop-in replacement K&N® High-Flow Air Filter™ can vary greatly depending on the severity of driving conditions—from 100 miles in a desert-racing environment to up to 50,000 miles under normal highway driving conditions. K&N replacement air filters that fit in the factory air box can go up to 50,000 miles before cleaning is required (under normal highway driving conditions), and the larger conical filters included with K&N air intake systems can go up to 100,000 miles before needing to be cleaned (under normal highway driving conditions). Follow this link to view complete cleaning instructions.

K&N® High-Flow Air Filters™ can be cleaned and re-oiled using a K&N Recharger® kit as often as is reasonably necessary. K&N drop-in replacement High-Flow Air Filters™ typically require servicing once every 50,000 miles under normal highway driving conditions, and the larger filters included with K&N intake systems can go up to 100,000 miles before needing to be cleaned (under normal highway driving conditions). Follow this link to view complete cleaning instructions.

Once you determine your K&N® DRYFLOW® air filter needs to be cleaned, K&N® air filter cleaning products help restore your air filter to like-new condition. There are specific cleaning kits available for non-oiled K&N filters. Follow this link to view complete cleaning instructions and available products.

Most K&N® cotton air filters come from the factory pre-oiled and ready to install. Certain specialty and racing filters are manufactured as un-oiled filters, and will be clearly indicated as such. Synthetic air filters (such as DRYFLOW® air filters) do not utilize filter oil. Please refer to the Product Specifications on the product details page for your air filter to determine if oil is required, or contact customer service.

When servicing your High-Flow Air Filter™, be sure to follow the re-oiling directions carefully. Use only K&N oil, and never saturate the filter. If oil drips from the filter, allow the filter to sit for several minutes until it stops dripping, and then wipe any excess oil from the filter frame. Follow the oiling instructions included in the Recharger® cleaning kit, and contact customer service if you have questions regarding the oiling process. For the required oil quantity by filter part number, enter the part number in the "Search by Part" box on our Application Search Page, and the factory oil amount will be shown.

Refer to our air filter cleaning and re-oiling procedure for details on how to properly oil your filter once it is clean and dry. For the required oil quantity by filter part number, enter the part number in the "Search by Part" box on our Application Search Page, and the factory oil amount will be shown.

If a tube of sealing grease was included with your air filter, the grease must be used during filter installation to ensure a good seal. Use K&N® sealing grease or lithium-based grease as a substitute. Do not use petroleum-based grease, as it may deteriorate the seal on your air filter.

K&N® does not recommend using other detergents or solvents to clean your air filter, and does not recommend applying any other type of oil. Products other than those manufactured by K&N® have not been tested and may deteriorate the performance and filtering ability of your air filter. Follow this link to view K&N® cleaning product options.

K&N® recommends against using compressed air to dry your air filter, as compressed air may rip and tear the filter fibers. Always allow the filter to dry naturally.

K&N® does not recommend the use of brushes to clean air filters, as the bristles from a brush may rip and degrade the filter media.


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