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Michigan Exhaust & Muffler Laws (2026)
Info: Passenger vehicles can't exceed 82 decibels above 35 mph, or 76 decibels at 35 mph or below, measured at 50 feet, and cutouts, bypasses (which route exhaust around the muffler), and amplifiers are banned (MCL § 257.707c).
Official source: legislature.mi.gov →
General legal information, not legal advice — verify important decisions with a licensed attorney.
Exhaust & Muffler in states bordering Michigan
The same rule in each neighboring state LawLert has verified, from that state’s own official source.
- IndianaInfo
Your vehicle needs a muffler in good working order, and cutouts and bypasses (which route exhaust around the muffler) are banned — the system can't leak or have altered parts. Indiana sets no fixed decibel limit (Ind. Code §§ 9-19-8-2, 9-19-8-3).
Verified Jul 30, 2026 · Source: iga.in.gov · Full Indiana rule →
- OhioInfo
Your vehicle needs a muffler in good working order, and a cutout or bypass (which routes exhaust around the muffler) is prohibited, along with devices that produce excessive smoke or gas. Ohio sets no fixed decibel limit (Ohio Rev. Code § 4513.22).
Verified Jun 19, 2026 · Source: codes.ohio.gov · Full Ohio 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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