K&N Engineering

K&N Engineering, Inc. (also known simply as "K&N") is a manufacturer of air filters, cold air intake systems, oil filters, performance parts, and other related products. K&N manufactures over 6,000 parts for various makes and models of cars, trucks, SUVs, motorcycles, ATVs, industrial applications and more. Founded in 1964, K&N is headquartered in Riverside, California, in a complex of 10 buildings comprising nearly 400,000 square feet. K&N also operates facilities in England and the Netherlands.

K&N was founded by Ken Johnson and Norm McDonald in 1964. The name K&N came from the first letters in the founders' first names. Johnson and McDonald sold motorcycles and motorcycle parts and supported a K&N factory race team. Air filters soon became the primary focus of the company. In the late 1980s, K&N introduced a bolt-on air intake kit to replace the factory air box and air filter. K&N also released a line of oil filters with a stamped hex to accept a standard wrench for installation and removal. K&N has maintained very active involvement in racing and motorsports throughout its history, including the NASCAR Pro Series East and West, and the King of the West 410 Sprint Car Series.

In February 2002, K&N entered the 24 Hours of Daytona race where up-and-coming driver, Joey Scarallo, was invited to be a driver.

K&N's claims for their air filters have been the subject of some controversy, with 3rd-party tests finding that K&N's cotton gauze filters are less efficient and let more dirt into the engine than factory-equipment paper filters, and that they become increasingly restrictive as they are coated with particulates.

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