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North Dakota Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler in good working order.

InfoVerified Jun 19, 2026

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Your vehicle needs a muffler in good working order. A cutout or bypass (which routes exhaust around the muffler) is prohibited, and excessive or unusual noise is barred. North Dakota sets no fixed decibel limit (N.D. Cent. Code § 39-21-37).

Official source: ndlegis.gov →

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