Muffler and noise rules for vehicles and mopeds

(a) A person may not operate a motor vehicle or moped on a public highway or street, unless the motor vehicle or moped is equipped, at all times, with a muffler or mufflers in constant operation and of such length and size or of sufficient capacity for the motor or exhaust system, or both, to prevent the escape of excessive or annoying fumes or smoke, and excessive or unusual noise. The term “excessive or unusual noise,” as used in this section, means noise in excess of the usual noise that would necessarily result from the operation of a motor when reduced to the minimum by a muffler operated in the manner and meeting the standards described in this subsection. (b) A person may not operate a motor vehicle or moped on a public highway or street unless the motor or exhaust system, or both, of the motor vehicle or moped are properly equipped and adjusted so as to prevent the escape of excessive or annoying fumes or smoke and the emission of excessive or unusual noise as defined in this section. (c) A person may not operate a motor vehicle or moped on a public highway or street with a motor or exhaust system, or both, that has been altered or modified to such an extent that the noise emitted by the motor or exhaust system, or both, thereof is excessive or unusual as defined in this section, or equipped with a dummy muffler, cut-out, by-pass, or other similar device. (d) A person may not operate a motor vehicle or moped on a public highway equipped with an exhaust system or device that will amplify or increase the noise emitted by the motor of such motor vehicle or moped above that emitted by the exhaust system or device with which the motor vehicle or moped came originally equipped from the factory. (e) A person may not operate a motor vehicle or moped on a public highway with a muffler with baffles or other interior parts, or both, that are not fixed or are not stationary. )