California Code of Regulations
Title 13 - Motor Vehicles
Division 2 - Department of the California Highway Patrol
Chapter 1 - Licensed Stations and Muffler Installers
Article 1 - Licensed Muffler Certification Stations
Section 604 - Displays, Maintenance of Equipment, and Records

(a) Display of Station License. The license of a muffler certification station shall be prominently displayed under glazing material in the customer area of the station.

(b) Display of Station Sign. Each muffler certification station, except a fleet owner station that certifies only its own vehicles, shall display a muffler station sign meeting the specifications in Section 606 of this title. The sign shall be displayed where it is clearly visible from outside the station.

(c) Posting of Prices. Each muffler certification station, except a fleet owner station that certifies only its own vehicles, shall post conspicuously in the customer area the prices for issuing exhaust certifications and for clearing enforcement documents.

(d) Care of Equipment. All adjusting, servicing, and testing equipment shall be maintained in good condition, and instruments and equipment requiring calibration shall be kept in calibration or adjustment in accordance with the instructions and recommendations of the manufacturer.