An act relating to motor vehicle noise, exhaust modifications, and engine compression brakes

This bill (S 66) regulates motor vehicle noise by prohibiting certain exhaust modifications and requiring mufflers for engine compression brakes. It bans straight pipes, gutted mufflers, and unapproved exhaust systems on most vehicles, while requiring motorcycles (post-1985) to meet federal noise standards. Truck operators must equip compression brakes (like "Jake brakes") with mufflers to prevent excessive noise, failing which vehicles will fail safety inspections. The law affects drivers of modified cars, trucks, and motorcycles, with new rules taking effect July 1, 2026. It also requires a report by December 2025 on proposed noise level limits and enforcement procedures.