Quote:
Originally Posted by PapoZalsa
In most states, all aftermarket parts that have to do with emissions are illegal if they don't have a CARB certification.
Other modifications might be illegal too, for example ride height.
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Ok show a law that says afermarket exausts in themselves are illegal. The laws are most likely written to outlaw higher emission levels and noise levels. Neither of these can be proven on the street by a cop by looking at your exaust.