Straight Pipes Legal States 2026

Straight pipes are an exhaust modification that replaces conventional muffler systems and can produce significantly louder exhaust noise. Whether an exhaust modification complies with the law depends on the jurisdiction, vehicle type, and use. Muffler requirements, restrictions on cutouts, and noise limits should be considered separately rather than treated as a single nationwide ban on every use of straight pipes.

Tennessee

Tennessee Code § 55-9-202, as reproduced by FindLaw with a stated currency date of January 2, 2024, makes it unlawful to drive a motor vehicle on a road, street, or highway without a muffler in good working order and constant operation. The section treats excessive or unusual noise or annoying smoke as evidence that the muffler does not meet that requirement. It also prohibits use of a muffler cutout on a motor vehicle on a road, street, or highway.

The section does not apply to farm tractors or implements of husbandry, as defined in § 55-8-101. A violation is a Class C misdemeanor. These provisions describe Tennessee’s specified road-use requirements and exceptions; they do not establish a nationwide rule for all vehicles or uses.