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I am in AZ (Cave Creek just north of Phoenix). Yup it is a damn hot one out there today! Window tint is only allowed to 30% visability on the driver side and fronth passenger window. Cops want to be able to see you thus it's law. Many go darker and have no problem, but if you get caught the police will key scratch the tint and give you a ticket. It happend to a friend of mine. As far as emmissions we need to run cats and vehicles are inspected every 2 years on newer cars and every year on older (not sure where the cutoff is). Pre 1974 no cats needed. The vehicle also needs to pass the tail pipe sniffer to ensure it within strict standards. I once ran a very hot stroker and siliconed emmission equipment on under the hood and welded up empty cats. I had to dyno the engine and retard the timing back so far it could barely run. It passed. If there is a will there is a way!
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