The intake and the exhaust minus header are legit. I bought my car brand new with them already installed. You should be good to that point anyway as far as under the hood goes. The Nismo header is a 'no-go' in terms of street use though. That's regardless of the pre-cat or not. The one with the cat might fool someone at first glance if you want to be cosmetic. I just figure since it's illegal in either case, I'm going with the header without the cat.