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Louisiana Exhaust & Muffler Laws (2026)

Info: Your vehicle needs a muffler in good working order, and cutouts and bypasses (which route exhaust around the muffler) are prohibited, while exhaust changes that increase noise are banned.

InfoVerified Jun 19, 2026

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Your vehicle needs a muffler in good working order, and cutouts and bypasses (which route exhaust around the muffler) are prohibited, while exhaust changes that increase noise are banned. Louisiana sets no fixed decibel limit (La. R.S. §§ 32:352, 32:353).

Official source: legis.la.gov →

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

Exhaust & Muffler in states bordering Louisiana

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 →
MississippiInfo
Every vehicle needs a muffler in good working order, running at all times, so it doesn't make excessive or unusual noise or annoying smoke, and no one may use a muffler cutout, bypass or similar device (which routes exhaust around the muffler) on a highway. See Miss. Code § 63-7-55. Mississippi sets no decibel number. Violations of Title 63, Chapter 7 are misdemeanors (§ 63-9-11).
Verified Jul 30, 2026 · Source: driverservicebureau.dps.ms.gov · Full Mississippi 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 →

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