Modified exhausts, loud stereos, and engine revving are prohibited under McKinney Code Chapter 62 and Texas Transportation Code 547.604 (muffler requirement). Sound audible beyond 30 feet from a vehicle is prima facie evidence of violation.
McKinney Code of Ordinances Chapter 62 (Offenses) prohibits unreasonably loud vehicle sound within city limits, working alongside Texas Transportation Code 547.604 which requires every motor vehicle to be equipped with a muffler in good working order and prohibits exhaust cutouts, bypasses, or similar devices. TX Transportation Code 547.605 separately bars muffler modifications that amplify noise above manufacturer specs. McKinney uses the 'plainly audible' standard: if an officer can clearly hear amplified stereo bass, revving, or modified exhaust from 30 feet away on a public street or 50 feet from the source on private property, that alone is prima facie evidence under Chapter 62. TX Penal Code 42.01 (Disorderly Conduct) also applies at an 85 dB threshold after a prior officer warning. Enforcement is handled by the McKinney Police Department traffic division; Class C misdemeanor citations carry fines up to $500, with repeat offenders subject to enhanced penalties and potential vehicle inspection orders.
Class C misdemeanor. First offense typically $150-$300, up to $500 maximum. Repeat violations within 12 months may trigger enhanced fines and referral to vehicle inspection.
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