Bill's Pipes has long been synonymous with 2-strokes. Years later, even into the 4-stroke era, that hasn't changed. The legendary championship-winning performance and build quality of the MX2 pipe is unrivaled and is designed to give you every bit of horsepower and torque gains imaginable. 19-gauge AKDQ carbon steel construction. Unplated finish gives you that "Works" look. Performance gains throughout the entire power band. Hand welded and assembled for a precise fit. Can be used with Bill's Pipes silencer or stock silencer. Hand-crafted in the U.S.A.