question about emissions?!?

[badazzbowties]

I have a question I have recently moved to Phoenix, AZ. and realized they expect my car ( a 1968 camaro) to pass a emissions test. Well it is not stock, and there is no way it will pass one, now I have seen other classic cars here above 1967 ( there emission cut-off year) which dont look,sound,smell stock and have arizona licenses and registration and I dont know how they do it. there has to be some kind of loop hole im not seeing. I know this question isnt in this subject but I wasnt really sure where to put it so if anyone from phoenix knows what im talking about and knows a secret or two please help me out because otherwise I dont know what to do. thanks