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DOT/FMCSA RIN: 2126-AB31 Publication ID: Fall 2010 
Title: ●Compliance With Interstate Motor Carrier Noise Emission Standards: Exhaust Systems 
Abstract: This direct final rule responds 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, 49 CFR 325.91(b) may allow vehicle operators to remove mufflers and still meet the Federal inspection requirements if commercial motor vehicle engines are equipped with turbochargers. This was not the intent of the rule. The rule must be amended to restore its original purpose. 
Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 49 CFR 393   
Legal Authority: 49 USC 31136(a)    49 USC 31502   
Legal Deadline:  None
Timetable:
Action Date FR Cite
Final Rule  09/20/2010  75 FR 57191   
Final Rule Effective  11/19/2010    
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: www.regulations.gov   Public Comment URL: www.regulations.gov  
RIN Data Printed in the FR: No 
Related Agencies: Common: EPA; 
Agency Contact:
Brian Routhier
Department of Transportation
Federal Motor Carrier Safety Administration
1200 New Jersey Avenue, SE,
Washington, DC 20590
Phone:202 366-1225
Email: brian.routhier@dot.gov