Compliance With Interstate Motor Carrier Noise Emission Standards: Exhaust Systems

In response to a petition for rulemaking from the Truck Manufacturers Association (TMA), the Federal Motor Carrier Safety Administration (FMCSA) amends its regulations to eliminate turbochargers from the list of equipment considered to be noise dissipative devices. As written, the regulation may allow vehicle operators to remove mufflers and still meet the Federal inspection requirements if commercial motor vehicle (CMV) engines are equipped with turbochargers. This was not the intent of that rule. Therefore, the Agency amends the rule to restore its original intent.