K&N Fuel Filter – PF-4000

K&N Engineering was founded in 1969 in Riverside, California by motorcycle racers Ken Johnson and Norm McDonald — the K and N behind the name. The company pioneered the high-flow oiled cotton gauze air filter: a washable, reusable element that flows more air than disposable paper while maintaining filtration.

K&N's range covers drop-in replacement panel filters, universal and cone induction filters, complete cold air intake systems, cabin air filters, and oil filters for cars, motorcycles, and light trucks. Their filters are designed to last the life of the vehicle — cleaned and re-oiled with a service kit rather than replaced — and are backed by a Million Mile Limited Warranty. K&N is one of the most recognised names in performance air filtration worldwide, fitting a vast range of road and track vehicles.