control number:24064254 The exhaust system has been measured for gas emissions (carbon monoxide, hydrocarbon and nitrogen oxide concentrations) and volume (proximity exhaust noise and accelerating noise) by the Japan Motorcycle Manufacturers Association (JMCA) and has been approved by the government.. The Silencer has a JMCAPlate as proof of certification and can be used on public roads with confidence.. It is the only lineup that allows you to enjoy the performance and quality of the Circuit's direct lineage in the STREET!.