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WHAT MAKES THE WORLD'S BEST AIR FILTER

CUSTOM COTTON FILTER MEDIA

Four or six layers of pleated cotton filter media act as a physical barrier to contaminants, with pleats specifically engineered to provide a large capturing area.

THE MAGIC SAUCE - RED 201 FILTER OIL

The original red filter oil is what separates K&N filters from the pack. The tacky oil helps trap—and hold—dirt and contaminants, keeping them in the filter and out of your engine.

DURABLE URETHANE FRAME

Liquid urethane is custom-poured and cured for a guaranteed fit, and engineered to last for a million miles of use.

EPOXY-COATED SCREEN MESH

Pleated mesh protects both sides of the cotton filter media and provides a sturdy structure for long-lasting durability.

CNC-MACHINED ALUMINUM FILTER MOLDS

Designed using advanced software and precision-milled from billet aluminum for a repeatable level of premium quality.

EXPLORE THE BENEFITS OF K&N WASHABLE AIR FILTERS

large cone air filter

THE ORIGINAL RED AIR FILTER SINCE 1969

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.

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.


washable and reusable replacement air filter

WASHABLE & REUSABLE

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.

INCREASE PERFORMANCE

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.

dodge charger on dyno
dodge charger on dyno

INCREASE PERFORMANCE

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.

SUV on sand dune

PROTECT YOUR ENGINE

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.

REDUCE WASTE

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.

landfill
landfill

REDUCE WASTE

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.

installing a K&N engine air filter

INSTALLS EASILY

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.

FILTER CLEANING SUPPLIES

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

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alt="K&N cleaning kits"

FILTER CLEANING SUPPLIES

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

SHOP BY SPECIALTY FILTERS

car air filters

SHOP BY DIMENSION

industrial engine air filters

INDUSTRIAL/SMALL ENGINE FILTERS

racing air filters

RACING AIR FILTERS

crankcase vent breather filters

CRANKCASE VENT AIR/BREATHER FILTERS

OUR STORY
WHY K&N?
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!

“ABSOLUTELY LOVE IT, BIKE BREATHES SO MUCH BETTER. LESS LAG ON TAKEOFF. IT'S AMAZING, AND I DEFINITELY NOTICED THE HP GAIN WHEN I GET ON THE THROTTLE. MY BIKE WENT FROM AN ANIMAL TO A MONSTER. THANKS K&N!”

— TERRENCE FROM PENNSYLVANIA, K&N AIR FILTER

Improve Vehicle Performance

K&N premium aftermarket performance products help your car, truck, motorcycle, dirt bike, or ATV perform its best—helping you obtain improved power and an enhanced driving experience from your vehicle. You’ll enjoy increased horsepower, torque, and acceleration—all from the vehicle you already own.

Love Your Car, Love the Environment

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

Protect critical systems

When using a poorly-designed disposable air filter, dust, dirt, and contaminants can make their way into your engine—causing damage and premature wear. In addition, an inefficient oil filter can allow oil contaminants to build up within the engine, reducing its working lifespan. K&N performance protection products are designed to keep contaminants where they belong—out of your engine.

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