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Montana Exhaust & Muffler Laws (2026)

Info: Muffler in good working order required preventing excessive noise/smoke; muffler cutouts and bypasses prohibited (no fixed dB) — Mont.

InfoVerified Jun 19, 2026

Muffler in good working order required preventing excessive noise/smoke; muffler cutouts and bypasses prohibited (no fixed dB) — Mont. Code Ann. §61-9-403.

Official source: mca.legmt.gov →

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