Quote:
Originally Posted by Lemers
Modifications in themselves generally are not illegal. If your OEM exhaust was damaged then you'ld be exspected to fix it. You can not be mandated to buy an OEM pat either. Where you may break the law in this case is noise level or emissions.
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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.