Vehicle Code section 27150.3

(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: Section 27150.3, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=VEH§ionNum=27150.­3.­ (updated Jan. 1, 2004; accessed Dec. 1, 2025).

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Verified:
Dec. 1, 2025

§ 27150.3's source at ca​.gov