Vehicle noise in Macomb County is governed by Michigan state law, not a county ordinance. MCL 257.707 requires every motor vehicle, including motorcycles and mopeds, to have a working muffler and bans muffler cutouts.
Macomb County does not set its own vehicle-noise standard; loud vehicles are enforced under the Michigan Vehicle Code by county sheriff's deputies and local police. MCL 257.707(1) requires a muffler in good working order and constant operation to prevent excessive or unusual noise, and prohibits removing muffler baffles or using a muffler cutout or bypass on a motorcycle or moped. Related sections (MCL 257.707c) set maximum decibel readings that vary by posted speed limit. Modified exhausts, loud aftermarket pipes, and 'straight pipes' are the typical targets. Local townships may add their own vehicle-noise provisions, but the statewide muffler rule applies uniformly across Macomb County.
A muffler or exhaust-noise violation under MCL 257.707 is a civil infraction; officers may also cite excessive-decibel readings under MCL 257.707c, with fines set by state law.
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