Theres nothing that comes with a ADR approved sticker on it if thats what you mean its bascially just up to you to make sure its 90db if you want it to be legal and pass, but doesnt really matter if it is or not because cops will report you on suspicion for exhuast sound as some people have been done on standard exhuast so theres not really a way to be 100 percent bullet proof on epa issues.
Also take into account the stock exhuast is basically the loudest you could have and be legal since it is around the 89db mark.