Damn near every aftermarket automotive part I have ever bought contains some variation of the “This is not intended for use on street vehicles, offroad and race use only” somewhere in the description.
I can cut out my cat and weld in a piece of 2 inch pipe and I just created an emissions defeat device… I can fit an oil catch can, if I plug the breather tube back into the intake its legal, if I vent to atmosphere its not.
I mean, people who “roll coal” have no sympathy from me but this case is nowhere near as cut and dried as a lot of people think.