Factory racing expansion chamber 125 (SX, XC) 23-25Suitable for standard silencers Greater performance due to special engine mapping Untreated surface Higher speed Uncompromising race look Improved throttle response and increases in both power and torque Designed to get the best performance from the motorcycle Substantial weight saving Saving 15 % weight compared to the stock expansion chamber (ca. 0,4 kg) Approvals: CCCUO_EU, FIM Factory Racing: USED BY FACTORY RACING Surface: Natural untreated