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Minnesota Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler in good working order so it doesn't make excessive or unusual noise, and muffler cutouts, bypasses (which route exhaust around the muffler), and similar devices are banned.

InfoVerified Jun 19, 2026

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Your vehicle needs a muffler in good working order so it doesn't make excessive or unusual noise, and muffler cutouts, bypasses (which route exhaust around the muffler), and similar devices are banned. Minnesota sets no decibel limit in statute (Minn. Stat. § 169.69).

Official source: revisor.mn.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Exhaust & Muffler in states bordering Minnesota

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

IowaInfo
Your vehicle needs a muffler in good working order so it doesn't make excessive or unusual noise, and muffler cutouts and bypasses (which route exhaust around the muffler) are prohibited. Iowa sets no fixed decibel limit (Iowa Code § 321.436).
Verified Jun 19, 2026 · Source: legis.iowa.gov · Full Iowa rule →
North DakotaInfo
Your vehicle needs a muffler in good working order, and a cutout or bypass (which routes exhaust around the muffler) is prohibited while excessive or unusual noise is barred. North Dakota sets no fixed decibel limit (N.D. Cent. Code § 39-21-37).
Verified Jun 19, 2026 · Source: ndlegis.gov · Full North Dakota rule →
South DakotaInfo
Your vehicle needs an exhaust system and muffler in good working order, the exhaust has to discharge to the rear or the side, and muffler cut-outs (which route exhaust around the muffler) are prohibited. South Dakota sets no fixed decibel limit (SDCL § 32-15-17).
Verified Jun 19, 2026 · Source: sdlegislature.gov · Full South Dakota rule →
WisconsinInfo
Your vehicle needs an adequate muffler operating at all times, and cutouts and bypasses (which route exhaust around the muffler) are prohibited, along with changes that amplify noise beyond the factory muffler. Wisconsin sets no fixed decibel limit (Wis. Stat. § 347.39).
Verified Jun 19, 2026 · Source: docs.legis.wisconsin.gov · Full Wisconsin rule →

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