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Originally Posted by DansSlk  It can be emissions or noise, normally for cat's its emissions and other parts noise. |
Normally has to do with noise and your car still has to pass emissions requirements for it's state. Of course, everyone builds vehicles (bikes and cars) for California and then you have to mod your exhaust to provide more HP. You have to find out what is legal in your state which is a pain.
Even here in Texas we are having to check exhausts and tuning (via reading the O2 Sensors). Have to move to a county where that is not required.