Cumberland County has no vehicle-noise ordinance. Vehicle exhaust and muffler noise is regulated statewide by the Maine Motor Vehicle Inspection Manual under Me. Rev. Stat. tit. 29-A § 1751 (mandatory annual inspection) and tit. 29-A § 1912 (mufflers required, no excessive noise). Cumberland County Sheriff and municipal police enforce on traffic stops.
Cumberland County publishes no subject-matter code, so there is no county vehicle-noise rule. The operative authorities are: (1) Me. Rev. Stat. tit. 29-A § 1912 — requires every motor vehicle to be equipped with a muffler in good working order and prohibits modifications that increase noise above original equipment levels; (2) Me. Rev. Stat. tit. 29-A § 1751 — annual safety inspection performed by state-licensed stations, with exhaust/muffler condition a mandatory check item per the Maine Motor Vehicle Inspection Manual (29-250 C.M.R. ch. 101); (3) Me. Rev. Stat. tit. 17-A § 501-A — disorderly conduct Class E when amplified vehicle audio or revving produces "loud and unreasonable noise" and an officer's cessation order is ignored. Cumberland County Sheriff's Office patrols unincorporated and contract towns, while each municipal police department enforces in its own jurisdiction.
Tit. 29-A § 1912 muffler/noise violations are traffic infractions — typically a fine of $100-$200 plus a 60-day correction order; inspection-sticker rejection is automatic for excessive exhaust noise. Disorderly conduct under tit. 17-A § 501-A is a Class E crime (up to 6 months / $1,000). Aftermarket exhaust modifications that defeat manufacturer noise controls are violations of federal EPA tampering rules (42 U.S.C. § 7522).
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