Texas Transportation Code §547.604 requires every motor vehicle to have a muffler in good working order and prohibits muffler cutouts. Cedar Park Article 8.08 exempts a properly-mufflered engine but DOES regulate amplified sound equipment in or attached to vehicles under the 85/70 dBA limits.
State law preempts local regulation of vehicle exhaust systems: Tex. Transp. Code §547.604 requires a muffler in continuous operation to prevent excessive or unusual noise and bans muffler cutouts, bypasses, and similar devices — enforceable by Cedar Park PD as a traffic violation. Cedar Park Article 8.08 exempts 'sound produced by a motor vehicle motor in good working order while the motor vehicle is moving on a public right-of-way,' but explicitly carves out sound-producing equipment in or attached to a motor vehicle (car stereos, subwoofers, PA systems, ice-cream-truck amplification), which must comply with the 85 dBA day / 70 dBA night limits. The Special Noise Exception process specifically bars nighttime exceptions for sound equipment operated from a motor vehicle.
Muffler violations: Class C misdemeanor under state law, typical fine $200+ plus court costs (Texas Transportation Code Ch. 542). Cedar Park stereo/amplification violations: Class C misdemeanor, fine up to $500/day under §1.01.009. Cedar Park PD enforces both.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Cedar Park, TX
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See how Cedar Park's vehicle noise rules stack up against other locations.
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