Section 38365 Of Article 4. Equipment From California Vehicle Code >> Division 16.5. >> Chapter 6. >> Article 4.
38365
. (a) Every off-highway motor vehicle, as defined in Section
38006, shall at all times be equipped with an adequate muffler in
constant operation and properly maintained so as to meet the
requirements of Section 38370, and no muffler or exhaust system shall
be equipped with a cutout, bypass, or similar device.
(b) The provisions of subdivision (a) shall not be applicable to
vehicles being operated off the highways in an organized racing or
competitive event upon a closed course or in a hill climb or drag
race, which is conducted under the auspices of a recognized
sanctioning body or by permit issued by the local governmental
authority having jurisdiction.