This K&N #Air #filter is designed to provide increased horsepower and torque. Pleated media provides a large filtration area offering long service intervals Multiple layers of woven cotton gauze media offers excellent filtration. Application specific base seal and sealing bead Made in the USA for over 40 years Washable & reusable, pre-oiled and ready to ride! Million-Mile Limited Warranty The K&N Air Filter for the Honda #CB400X, #CB400R & #CB400F 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. Installation can be provided at an additional fee.