PRO CIRCUIT Works Expansion Chamber Steel Kawasaki KX500 PK89500-02The original Pro Circuit Works Pipe offers unparalleled performance and power for every two stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some maintenance, but really gives your bike that "Works Look". Stamped AKDQ high quality carbon steel constructionHand welded and pounded seamsReinforced mounting brackets and stinger Homologation: FIM