This bill amends existing New Jersey law to prohibit the installation or modification of a motor vehicle's muffler or exhaust system in a way that amplifies or increases the noise emitted beyond what was originally installed. The penalties for violating this provision include a fine of up to $500, imprisonment for up to 30 days, or both. Additionally, the bill mandates that motor vehicle inspections must now include checks for excessive or unusual noise from mufflers and exhaust systems, expanding the current focus on emissions and emission-related items.

The bill also introduces new legal language regarding the requirements for vehicle horns, sirens, and the use of theft alarm devices. It specifies that every motor vehicle must have a functioning horn that is audible from at least 200 feet, while prohibiting the use of sirens, whistles, or bells on non-emergency vehicles. Furthermore, the bill empowers the commission to establish standards for the audibility of warning devices and outlines the inspection process for vehicles, ensuring they comply with noise regulations. Overall, the bill aims to enhance noise control measures for motor vehicles on New Jersey roads.