Vehicle Exhaust Noise

Texas Vehicle Exhaust Noise Laws

Many car enthusiasts decide to modify their car’s exhaust system, but there are laws governing the noise limit your vehicle can produce. The section below outlines relevant laws and legislation pertaining to car exhaust noise laws in Texas.

The following law excerpts are from Texas Transportation Code, § 547.604(a).


(a) A motor vehicle shall be equipped with a muffler in good working condition that continually operates to prevent excessive or unusual noise.

(b) A person may not use a muffler cutout, bypass, or similar device on a motor vehicle.

Texas exhaust noise laws summary:

Ay exhaust system modifications on vehicles registered in Texas must not produce “excessive or unusual” noise.

Essentially this means many exhaust system modifications frequently done on sports or racing vehicles can be considered illegal. If you install aftermarket exhaust modifications make sure it does not produce excessive noise.

Texas laws do not specify noise limit in decibels, therefore the law is open to interpretation. During vehicle exhaust inspections, exhaust noise is not checked.

Sources and more info:

  • Texas Transportation Code § 547.604(a) (see in Subtitle C: Rules of the Road, Chapter 547: Vehicle Equipment, Subchapter K: Provisions relating to other vehicle equipment, Section 604: Muffler Required).

Please remember that state laws are subject to change, and it is important to consult the current statutes and regulations in Texas but also your local city or county to ensure accurate information.

This article about Texas Vehicle Exhaust Noise Laws was last updated in 2020. If any of our information is incomplete or outdated please let us know. Thank you!