IN STOCK • FREE SHIPPING OVER $25 Find A DealerSupport MORE SEARCHES AIR FILTERS INTAKE SYSTEMS OIL FILTERS CABIN AIR FILTERS SPEED SHOP POWERSPORTS HOME AIR FILTERS 50 YEARS OF PERFORMANCE FILTRATION INNOVATION ABOUT K&N For over 50 years, K&N® has been an industry-leader in automotive filtration and technology—offering products to increase performance, protection, and longevity in thousands of vehicle applications for consumers worldwide. OUR HISTORY In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N), developed a ground-breaking new idea for an air filter—one that could perform under the demands of dusty, dirty off-road environments. After experimenting with numerous types of filter media, they discovered that an oiled cotton design allowed the filter to not only capture contaminants very efficiently, but also allowed it to be washed and reused, and the original K&N® High-Flow Air Filter™ was born. 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. K&N HIGHLIGHTS 2019 K&N releases a premium washable home air filter line 2021 K&N introduces Filtration for the Future and gives their iconic logo a facelift. 1952 Ken Johnson and Norm McDonald are both avid dirt-track racers in Southern California, and meet for the first time 1957 Ken Johnson and Norm McDonald decide to go into business together, and open a motorcycle shop in Loma Linda, California 1969 Ken & Norm start developing a brand-new filter design—which would later become the iconic K&N High-Flow Air Filter™. K&N as a filter company is officially born. (Pictured: K&N’s first manufacturing building in Riverside, CA) Learn more about the origins of K&N straight from the founders, Norm McDonald and Ken Johnson. WHAT MAKES K&N THE BEST IN THE AFTERMARKET? All K&N products undergo rigorous testing to ensure that they adhere to demanding quality standards. We stand behind our products with some of the most extensive warranties in the aftermarket. HORSEPOWER TESTING Horsepower and torque claims are based on testing of an actual vehicle on a dynamometer before and after a K&N product has been installed. Horsepower/torque testing is performed on Dyno Jet 248 and SuperFlow 880E dynamometers, which measure actual brake horsepower and torque at the wheel(s) receiving power from the drive train. For most intake systems, dynamometer charts are available on the individual product pages under “Resources”. AIRFLOW TESTING K&N performs all airflow testing on a SuperFlow Corporation SF-1020 flow bench. The SF-1020 is a computerized flow bench capable of measuring airflow rates up to 1020 cubic feet per minute (cfm) at test pressures of up to 65 inches of water. To read the details of air filter testing protocol, please visit the airflow testing protocol page. PRODUCTS AND FACILITIES In addition to performance air filters, K&N® manufactures a variety of other protection and performance products, including air intake systems, oil filters, fuel filters, cabin air filters, and home air filters. Over the course of five decades, we’ve built a reputation for exceptional quality and customer service that millions of customers trust. K&N products are designed and manufactured on-site. K&N® is headquartered in Riverside, California, in a building complex spanning nearly 400,000 square feet, and also operates facilities in Grand Prairie, TX, England, China, and the Netherlands. K&N facilities include departments for engineering, product design, manufacturing, warehousing, test facilities, purchasing, sales, customer service, marketing, and corporate offices. K&N WAREHOUSE DYNAMOMETER TESTING VIBRATION TESTING LAB RACING AND PARTNERS K&N is a proud partner of many prominent sports organizations, including NASCAR, NHRA, and many others. To view all of our upcoming events, please view our events schedule. VIEW EVENTS SCHEDULE STILL HAVE QUESTIONS? 1-800-858-3333 For any product related questions, please send us a message: tech@knfilters.com Frequently Asked Questions We use cookies to personalize content and ads, to provide social media features and to analyze our traffic. We also share information about your use of our site with our social media, advertising and analytics partners. Learn more. ALLOW COOKIES SUPPORT Contact Customer Service Warranty & Registration Shipping & Returns FAQs Let K&N Borrow Your Vehicle! 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