Prohibits modification of mufflers and exhaust systems to produce audible sounds; increases penalties for violations.

This bill prohibits modifying a vehicle's muffler or exhaust system to produce louder noise than the original factory setting. It directly affects car owners who install aftermarket exhaust systems that amplify sound beyond standard levels. The bill increases penalties for violations from a $25 fine to a maximum of $500 or 30 days in jail. The law aims to reduce noise pollution by enforcing stricter standards on vehicle exhaust systems under New Jersey's existing traffic safety regulations.