The Yoshimura RS-2 Mini is the perfect fit for these little fun machines. Adds torque and horsepower to the 125cc street fighter while removing the unwanted weight of the under-performing stock system. These systems feature Yoshimura's proprietary Works Finish that adds style and durability. With the RS-2 mini Race Series system, these bikes can now reach their full potential. Works Finish header surface treatment adds titanium look and durability Diamond-shaped sleeve Large core and increased muffler packing volume means quieter operation Stainless steel cone end-cap Stainless steel header and tail-pipe The Yoshimura Works Finish takes on a unique coloring after it goes through a heat cycle on the motorcycle that looks much like those titanium works components our factory racers use Contemporary Satin/matte finish Uniform heat coloration Increased fatigue strength Increased scratch and stain resistance