A K&N air filter is an air filter manufactured by K&N Engineering. K&N manufactures a wide variety of air filters that are typically designed to provide high airflow and improved dirt protection for improved engine performance.
K&N air filters are designed to increase horsepower and acceleration. Air filters are available for common automotive and performance racing engines, as well as for small, industrial and diesel engines. K&N also sells air intake systems, oil filters and cleaning kits. Many products are available with a million-mile limited warranty. As of 2015, K&N filters are available on the official company website, as well as from general online marketplaces such as Amazon.