Listed is the law covering mufflers from the Model Traffic Code for Colorado Municipalities:
Sec 225. Mufflers-prevention of noise. “(1) 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 excessive or unusual noise, and no such muffler or exhaust system shall be equipped with a cut-off, bypass, or similar device. 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 about that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all of the requirements of this section.
(2) A muffler is a device consisting of a series of chamber or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing noise.”
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