California Code, Vehicle Code - VEH § 27200

(a) The Department of Motor Vehicles shall not register on a dealer's report of sale a new motor vehicle, except an off-highway motor vehicle subject to identification as provided in Division 16.5 (commencing with Section 38000), which produces a maximum noise exceeding the applicable noise limit at a distance of 50 feet from the centerline of travel under test procedures established by the Department of the California Highway Patrol.

(b) The Department of Motor Vehicles may accept a dealer's certificate as proof of compliance with this article.

(c) Test procedures for compliance with this article shall be established by the Department of the California Highway Patrol, taking into consideration the test procedures of the Society of Automotive Engineers.

(d) No person shall sell or offer for sale a new motor vehicle, except an off-highway motor vehicle subject to identification as provided in Division 16.5 (commencing with Section 38000), which produces a maximum noise exceeding the applicable noise limit specified in this article, and for which noise emission standards or regulations have not been adopted by the Administrator of the Environmental Protection Agency pursuant to the Noise Control Act of 1972 (P.L. 92-574). 1

(e) No person shall sell or offer for sale a new motor vehicle, except an off-highway motor vehicle subject to identification as provided in Division 16.5 (commencing with Section 38000), which produces noise that exceeds or in any way violates the noise emission standards or regulations adopted for such a motor vehicle by the Administrator of the Environmental Protection Agency pursuant to the Noise Control Act of 1972 (P.L. 92-574).

(f) As used in this section, the term “register” is equivalent to the term “licensing” as used in Section 6(e)(2) of the Noise Control Act of 1972 (P.L. 92-574;  Title 42, United States Code, Section 4905(e)(2)). 2