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Superchargers are legal (if they have a CARB or EO number)
Most shorty headers are just as illegal as Long tubes so feel free for those.
Exhaust is pretty much open, so long as it doeesn't exceed 97 or 107 decibels (I forget which is the legal limit)
In my opinion, for street use, torque is king, so you'll want longtubes or a top mount supercharger or both for the best performance, as well as drop springs and some bushings. Otherwise intake and exhaust will give you a little bit of sound and performance. Wheels and lowering the cars stance will give you the most obvious cosmetic upgrades. It really just depends on what you're going for.
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