Custom non-road engines are found in many track only cars. And if you are to read the article I posted early, even the EPA doesn't really care if a street car i

Custom non-road engines are found in many track only cars. And if you are to read the article I posted early, even the EPA doesn't really care if a street car is converted to a track car so long as it's never used on the street. It might be technically illegal to do, but the enforcing agency doesn't care. Pretty similar to things like federal enforcement of marijuana. Not legal, but not generally not enforced.