The 629-page proposal the EPA/National Highway Traffic Safety Administration (NHTSA) published (July 13, 2015, Federal Register (FR)) to set Phase II GHG emissions and fuel-efficiency standards for medium- and heavy-duty engines and vehicles contained a few short paragraphs from the EPA that caused a major uproar in the auto racing community.
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Specifically, the proposal would prohibit the modification of certified heavy-duty vehicles or heavy-duty engines and their emissions-control devices if they are used solely in racing competitions. In response to the negative feedback, several North Carolina lawmakers introduced the Recognizing the Protection of Motorsports Act of 2016 ((RPM Act), H.R. 4715). The bill would amend the relevant portions of the Clean Air Act (CAA) to block the EPA from prohibiting the modification of vehicles for racing.