K&N Engineering, of Riverside, California, is the inventor and
leading innovator of reusable cotton gauze filter technology for
automotive applications. Today, K&N exists as both the sales
and brand leader for performance filters, and maintains a stocking
catalogue of over 3,500 part numbers, including an extensive line
of both factory replacement drop-in filters, FIPK (Fuel Injection
Performance Kit) applications, and its line of innovative
Performance Gold oil filters.