From what I can find, "track use" isn't in the law, but rather a matter of enforcement discretion. "The Clean Air Act does not contemplate removing emissions c

From what I can find, "track use" isn't in the law, but rather a matter of enforcement discretion. "The Clean Air Act does not contemplate removing emissions controls from an EPA-certified motor vehicle in order to convert it into a competition vehicle. As a matter of enforcement discretion, the EPA’s longstanding practice has been not to take enforcement action against vehicle owners for removing or defeating the emission controls of their EPA-certified motor vehicles, so long as they can show the vehicles are used solely for competition events and no longer driven on public roads." https://www.autoweek.com/news/industry-news/a36482793/sema-epa-coming-for-your-race-car/ https://www.autoweek.com/news/industry-news/a36482793/sema-e...