Section 607 - Classes of Muffler Certification StationsMuffler certification stations shall be licensed only for the vehicle category specified on the application in accordance with the classes following. Stations shall be licensed to certify systems on the basis of certified parts. A station may, in addition, be licensed to certify on the basis of sound level readings made by the station.
(a) Passenger Car Stations. Passenger car stations shall certify exhaust systems for all motor vehicles, other than motorcycles and motordriven cycles, with a gross vehicle weight rating of less than 6,000 lb (2,722 kg).(b) Motorcycle Stations. Motorcycle stations shall certify exhaust systems for all motorcycles and motor-driven cycles (when exhaust system regulations are established for these vehicles).(c) Truck Stations. Truck stations shall certify exhaust systems for all motor vehicles with a gross vehicle weight rating of 6,000 lb (2,722 kg) or more (when exhaust system regulations are established for these vehicles).Cal. Code Regs. Tit. 13, § 607