Vehicle noise is set by state law, which applies throughout Chester County. Under 75 Pa.C.S. section 4523, every motor vehicle must have a working muffler with no cutout or bypass, and no one may modify an exhaust to amplify noise above the state limit. Local police enforce it.
Pennsylvania regulates motor-vehicle noise statewide through the Vehicle Code, which applies uniformly across Chester County's roads. Section 4523(c) of Title 75 requires every motor vehicle to have a muffler or effective noise-suppressing system in good working order and constant operation, and forbids any cutout, bypass or similar device. Section 4523(d) bars modifying an exhaust system to amplify or increase engine noise above permitted levels. The specific decibel ceilings are set in 67 Pa. Code Chapter 157. Municipal police, PennDOT-authorized inspection stations and State Police enforce these rules; some boroughs like West Chester also bar working on vehicles so as to create unreasonable noise.
A muffler or exhaust violation under 75 Pa.C.S. 4523 is a summary traffic offense with a fine, and a vehicle can fail state safety inspection. Enforced by municipal and State Police.
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See how Chester County's vehicle noise rules stack up against other locations.
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