K&N Engineering K&N 79-85 Honda CM400 CB/CM450 3inch ID x 4.25inch OD x 5.313inch H Round Replacement Air Filter HA-0850

KN Drop in Air Filters

K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application and are designed to provide low restriction and increased performance, while providing excellent engine protection for your motorcycle.

K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application and are designed to provide low restriction and increased performance.