![]() ![]() Other 3rd-party testing noted that a K&N oiled filter increased horsepower over its OEM counterpart. However, air filters in general become more airflow-restrictive as they collect contaminants, but efficiency typically increases for the majority of a filter’s service life. K&N's claims for their air filters have been the subject of some controversy, with some 3rd-party tests finding that K&N's oiled cotton gauze filters are less efficient and let more dirt into the engine than original-equipment paper filters, and that they become increasingly restrictive as they are coated with particulates. K&N has maintained very active involvement in racing and motorsports throughout its history, including the NASCAR Pro Series East and West, the King of the West 410 Sprint Car Series, the NHRA, and Formula Drift. In 2019, K&N released a line of washable home A/C filters, and began offering motor oil and wiper blades in 2021. K&N also released a line of oil filters with a stamped hex to accept a standard wrench for filter removal. ![]() In 1992, K&N introduced bolt-on cold air intake kits. Air filters soon became the primary focus of the company. Johnson and McDonald sold motorcycles and motorcycle parts and supported a K&N factory race team. The name K&N came from the first letters in the founders' first names. K&N was founded by Ken Johnson and Norm McDonald in 1969. ![]()
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