California · Vehicle Code
VEH §27150.3: (a) A person may not modify the exhaust system of a motor vehicle with a whistle-tip.
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(a) A person may not modify the exhaust system of a motor vehicle with a whistle-tip. (b) A person may not operate a motor vehicle if that vehicle’s exhaust system is modified in violation of subdivision (a). (c) A person may not engage in the business of installing a whistle-tip onto a motor vehicle’s exhaust system. (d) For purposes of subdivisions (a) and (c), a “whistle-tip” is a device that is applied to, or is a modification of, a motor vehicle’s exhaust pipe for the sole purpose of creating a high-pitched or shrieking noise when the motor vehicle is operated.
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