§ 36-66. Mufflers; excessive fumes or smoke.
Latest version.
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A.Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise or annoying smoke, and no person shall operate on the streets a motor vehicle equipped with a muffler cutout, bypass or similar device, or a device for the purpose of causing flame or smoke to be emitted from a vehicle, except a highway maintenance vehicle.B.The engine and power mechanism of every motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes or smoke.
Traf. Code § 53b