I don't know if they DOT approve cat-back systems. As long as you have a catalytic converter on there, you should be able to pass emissions.
As far as the police pulling you over, it was more than likely for it being louder than stock. What kind of ticket did they give you?
www.kronosperformance.com / 732-742-8837
last time I got poped by the cops for my exhaust was when I had my old Mazda MX6, and I just got a warning
Some times the best way to get that tailgater off your but is to light a fart.
