← Oklahoma driving laws›Exhaust & Muffler

Oklahoma Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler or other noise-suppressing system, a cutout or bypass (which routes exhaust around the muffler) is prohibited, and so is any exhaust change that's louder than the factory (OEM) setup.

InfoVerified Jun 19, 2026

Vehicle rules change at the state line — and in your state.Track them in the free LawLert iPhone app: it alerts you when you cross into a state where they differ, and when they change in your state. No account.Get the app

Your vehicle needs a muffler or other noise-suppressing system, a cutout or bypass (which routes exhaust around the muffler) is prohibited, and so is any exhaust change that's louder than the factory (OEM) setup. Oklahoma sets no fixed decibel limit (47 O.S. § 12-402).

Official source: oscn.net →

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

Exhaust & Muffler in states bordering Oklahoma

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

ArkansasInfo
Your vehicle needs a factory-spec muffler in good order, and cutouts and bypasses (which route exhaust around the muffler) are banned, along with any device that produces excessive noise or smoke. Arkansas sets no fixed decibel limit (Ark. Code § 27-37-601).
Verified Jul 30, 2026 · Source: ardot.gov · Full Arkansas 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 →
KansasInfo
Your vehicle needs a muffler or other effective noise-suppressing system in good order, and cutouts and bypasses (which route exhaust around the muffler) are prohibited, while excessive noise is barred. Kansas sets no fixed decibel limit (K.S.A. § 8-1739).
Verified Jun 19, 2026 · Source: kslegislature.gov · Full Kansas rule →
MissouriInfo
Your vehicle needs a properly attached muffler to quiet the exhaust, and muffler cutouts and excessive noise are barred — a violation is an infraction. Missouri sets no fixed decibel limit (Mo. Rev. Stat. § 307.170).
Verified Jun 19, 2026 · Source: revisor.mo.gov · Full Missouri 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 →
TexasInfo
Your vehicle needs a muffler in good working condition so it doesn't make excessive or unusual noise, and a cutout, bypass or similar device (which routes exhaust around the muffler) is prohibited. Texas sets no fixed decibel limit (Tex. Transp. Code § 547.604).
Verified Jun 19, 2026 · Source: statutes.capitol.texas.gov · Full Texas rule →

Don't get caught off guardCross into a state where this law is different and the free iPhone app tells you what changed, even with the app closed. It also alerts you when a law you track changes where you live. No account.Get the free app

Track this law — get alerted when it changes

We watch the official sources behind Oklahoma vehicle rules. If a tracked rule changes, you get one short email — never more than one a week. Free, unsubscribe anytime.