Section 27150.3.
Cal. Vehicle Code - VEH § 27150.3.
in effect(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.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026