Calif Noise Law as of 2019, really long sorry.

[Moto One]

The rest of the Law.
27156.1. The installation, prior to January 1, 1974, of an auxiliary gasoline fuel tank for use on a 1973 or earlier model year motor vehicle, which vehicle is required, pursuant to Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or the National Emission Standards Act (42 U.S.C., Secs. 1857f-1 to 1857f-7, inclusive), to be equipped with a fuel system evaporative loss control device, shall not be deemed a violation of Section 27156 of this code. As used in this section, the term “auxiliary gasoline fuel tank,” has the same meaning as defined in subdivision (b) of Section 43834 of the Health and Safety Code.
(Amended by Stats. 1975, Ch. 957.)

27156.2. Notwithstanding any other provision of law, any publicly owned authorized emergency vehicle operated by a peace officer, as defined in Section 830 of the Penal Code, any authorized emergency vehicle, as defined in Section 165 and used for fighting fires or responding to emergency fire calls pursuant to paragraph (2) of subdivision (b) or pursuant to subdivision (c) or (d) of that section, and any publicly owned authorized emergency vehicle used by an emergency medical technician-paramedic, as defined in Section 1797.84 of the Health and Safety Code, is exempt from requirements imposed pursuant to California law and the regulations adopted pursuant thereto for motor vehicle pollution control devices.
(Added by Stats. 1981, Ch. 595, Sec. 1.)

27156.3. Notwithstanding any other provision of law, any motor vehicle of mosquito abatement, vector control, or pest abatement districts or agencies, any authorized emergency vehicle as defined in Section 165, except subdivision (f) thereof, and any ambulance used by a private entity under contract with a public agency, is exempt from requirements imposed pursuant to California law and the regulations adopted pursuant thereto for motor vehicle pollution control devices.
(Added by renumbering Section 27156.2 (as added by Stats. 1981, Ch. 669) by Stats. 1982, Ch. 466, Sec. 116.)

27157. The State Air Resources Board, after consultation with, and pursuant to the recommendations of, the commissioner, shall adopt such reasonable regulations as it determines are necessary for the public health and safety regarding the maximum allowable emissions of pollutants from vehicles upon a highway. Such regulations shall apply only to vehicles required by Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or any federal law or regulation to be equipped with devices or systems to control emission of pollutants from the exhaust and shall not be stricter than the emission standards required of that model year motor vehicle when first manufactured.
(Amended by Stats. 1979, Ch. 373.)

27157.5. The State Air Resources Board, after consultation with, and pursuant to the recommendations of, the commissioner, shall adopt such reasonable standards as it determines are necessary for the public health and safety for the emission of air pollutants from the exhaust of motor vehicles of 1955 through 1965 model years. These standards shall be based on the normal emissions of such cars when the timing and carburetor are in proper adjustment and the spark plugs are in proper operating condition.
(Added by Stats. 1971, Ch. 1095.)

27158. After notice by a traffic officer that a vehicle does not comply with any regulation adopted pursuant to Section 27157, no person shall operate, and no owner shall permit the operation of, such vehicle for more than 30 days thereafter unless a certificate of compliance has been issued for such vehicle in accordance with the provisions of Section 9889.18 of the Business and Professions Code or unless the department has checked the vehicle and determined that the vehicle has been made to comply with such regulation adopted pursuant to Section 27157. A certificate of compliance issued for such vehicle shall, for a period of one year from date of issue, constitute proof of compliance with any regulations adopted pursuant to Section 27157 provided that no required pollution control device has been disconnected, modified, or altered or has been adjusted by other than a licensed installer in a licensed motor vehicle pollution control device installation and inspection station subsequent to the issuance of the certificate of compliance. The provisions of this section shall apply to the United States and its agencies to the extent authorized by federal law.
(Amended by Stats. 1974, Ch. 769.)

27158.5. After notice by a traffic officer that a motor vehicle does not comply with any standard adopted pursuant to Section 27157.5, no person shall operate, and no owner shall permit the operation of, such motor vehicle for more than 30 days thereafter unless a certificate of compliance has been issued for such vehicle in accordance with the provisions of Section 9889.18 of the Business and Professions Code or unless the department has checked the vehicle and determined that the vehicle has been made to comply with such standard adopted pursuant to Section 27157.5. A certificate of compliance issued for such vehicle shall, for a period of one year from date of issue, constitute proof of compliance with the standards determined pursuant to Section 27157.5.
(Amended by Stats. 1974, Ch. 769.)

27159. Any uniformed member of the California Highway Patrol may order a vehicle stored when it is located within the territorial limits in which the member may act if requested by a representative of the State Air Resources Board to remove the vehicle from service pursuant to subdivision (f) of Section 44011.6 of the Health and Safety Code. All towing and storage fees for a vehicle removed under this section shall be paid by the owner.
(Added by Stats. 1990, Ch. 1433, Sec. 24.)