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Missouri Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a properly attached muffler to quiet the exhaust.

InfoVerified Jun 19, 2026

Your vehicle needs a properly attached muffler to quiet the exhaust. Muffler cutouts and excessive noise are barred, and a violation is an infraction. Missouri sets no fixed decibel limit (Mo. Rev. Stat. § 307.170).

Official source: revisor.mo.gov →

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