Section 27150 Of Article 2. Exhaust Systems From California Vehicle Code >> Division 12. >> Chapter 5. >> Article 2.
27150
. (a) Every motor vehicle subject to registration shall at all
times be equipped with an adequate muffler in constant operation and
properly maintained to prevent any excessive or unusual noise, and
no muffler or exhaust system shall be equipped with a cutout, bypass,
or similar device.
(b) Except as provided in Division 16.5 (commencing with Section
38000) with respect to off-highway motor vehicles subject to
identification, every passenger vehicle operated off the highways
shall at all times be equipped with an adequate muffler in constant
operation and properly maintained so as to meet the requirements of
Article 2.5 (commencing with Section 27200), and no muffler or
exhaust system shall be equipped with a cutout, bypass, or similar
device.
(c) The provisions of subdivision (b) shall not be applicable to
passenger vehicles being operated off the highways in an organized
racing or competitive event conducted under the auspices of a
recognized sanctioning body or by permit issued by the local
governmental authority having jurisdiction.