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Utah Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler or other effective noise-suppressing system in good working order, and a cut-out, bypass or similar device (which routes exhaust around the muffler) is prohibited.

InfoVerified Jun 19, 2026

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Your vehicle needs a muffler or other effective noise-suppressing system in good working order, and a cut-out, bypass or similar device (which routes exhaust around the muffler) is prohibited. Utah sets no fixed decibel limit (Utah Code § 41-6a-1626).

Official source: le.utah.gov →

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

Exhaust & Muffler in states bordering Utah

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

ArizonaInfo
Your vehicle needs a working muffler. A muffler cutout or bypass (which routes exhaust around the muffler) is prohibited, and excessive fumes or smoke are barred. A violation carries a civil penalty. Arizona sets no fixed decibel limit (A.R.S. § 28-955).
Verified Jul 23, 2026 · Source: azleg.gov · Full Arizona rule →
ColoradoInfo
Your vehicle needs an adequate muffler. A cutoff or bypass (which routes exhaust around the muffler) is prohibited, and so is any exhaust change that raises noise above the stock level. Colorado sets no fixed decibel limit for passenger cars (C.R.S. § 42-4-225).
Verified Jul 22, 2026 · Source: leg.colorado.gov · Full Colorado rule →
IdahoInfo
Your vehicle needs a muffler in good order, and cutouts and bypasses (which route exhaust around the muffler) are banned, along with changes that make the exhaust louder — in Idaho, "excessive noise" means more than 92 decibels measured at 20 feet (Idaho Code §§ 49-937, 49-106).
Verified Jun 19, 2026 · Source: legislature.idaho.gov · Full Idaho rule →
NevadaInfo
Your vehicle needs a muffler in good working order that meets the Department's rules, and cutouts and bypasses (which route exhaust around the muffler) are banned on the highway. No fixed decibel limit is confirmed (NRS § 484D.415).
Verified Jun 19, 2026 · Source: leg.state.nv.us · Full Nevada rule →
New MexicoInfo
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. New Mexico sets no fixed decibel limit (N.M. Stat. § 66-3-844).
Verified Jul 30, 2026 · Source: nmonesource.com · Full New Mexico rule →
WyomingInfo
Your vehicle needs a muffler or other effective noise-suppressing system in good working order, and a cut-out, bypass or similar device (which routes exhaust around the muffler) is prohibited. Wyoming sets no fixed decibel limit (Wyo. Stat. § 31-5-953).
Verified Jul 22, 2026 · Source: wyoleg.gov · Full Wyoming rule →

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