The MotoSport.com Pro Circuit Pipe And Silencer Combo includes ONE Pro Circuit Works, Platinum or Platinum 2 Pipe and ONE Pro Circuit R 304 Shorty or Factory 304 Silencer, each with the following features: Pro Circuit Works Pipe: The original Pro Circuit Works Pipe offers unparalleled performance and power for every two-stroke application. It was developed to get you and your dirt bike to the finish line with a few extra style points. Increased horsepower and torque gains will quickly be noticed across the entire RPM range. Top quality craftsmanship from Pro Circuit is what goes into constructing every hand welded and pounded Works pipe. The unplated, oiled metal finish requires some maintenance, but really gives your bike that "Works Look". Stamped AKDQ high-quality carbon steel construction. Hand welded and pounded seams.