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Missouri Exhaust & Muffler Laws (2026)

Info: Properly attached muffler required to quiet exhaust; muffler cutouts and excessive noise barred (no fixed dB); violation an infraction — Mo.

InfoVerified Jun 19, 2026

Properly attached muffler required to quiet exhaust; muffler cutouts and excessive noise barred (no fixed dB); violation an infraction — Mo. Rev. Stat. §307.170.

Official source: revisor.mo.gov →

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