(a) Every motor vehicle subject to registration and operated on a highway shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excess or unusual noise, and no such muffler or exhaust system shall be equipped with a cut-out, by-pass, or similar device.

(b) No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle and such original muffler shall comply with all of the requirements of this Section.

(c) A muffler is a device consisting of a series of chambers or baffle plates, or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine, and effective in reducing noise.

SOURCE: GC § 23113.1, enacted by P.L. 3-016 (July 14, 1955).

2015 NOTE: Subsection designations were added to adhere to the
Compiler’s codification scheme pursuant to authority by 1 Guam Code Ann. § 1606.