K&N Engineering High Flow Air Filter KA-1020Million mile manufacturers warranty. Washable and reusable. High air flow for increased horsepower and torque. Designed with less pleats in order to open up the intake tract. Built with only two layers of special pleated cotton media. Fits directly into your OEM air box assembly with an OEM style sealing bead. Race Spec sport bike filters are designed for closed course competition use only. Made in the USA.