K&N Engineering, Inc.

K&N Engineering, Inc. is a manufacturer of automobile parts that is best known for its namesake air filter. It is headquartered in Riverside,California.

K&N Engineering was founded by Ken Johnson and Norm McDonald. K&N Engineering became known for its performance air filters for motorcycles and racing vehicles. K&N air filters were first used by off-road racers. The extremely dirty conditions in off-road racing quickly clogged the paper filters that were available at the time. K&N's filter technology was applied to automotive applications. K&N manufactures the majority of its products in-house.

K&N's air filter is an automotive air filter constructed of cotton gauze material sandwiched between aluminium wire mesh. The filter withstands repeated washings unlike paper filters. After washing, the filter is treated with an oil. Introduced in 1969 by K&N Engineering, Inc., the company states that owners can drive for 50,000 to 100,000 miles between cleaning and claims a million mile warranty.
K&N offers several lines of cold air intake systems. K&N product lines include Fuel Injection Performance Kits, AirCharger Intake Systems, Typhoon Intake Systems, and High Flow Intakes.