Quote:
Originally Posted by jflogerzi
In CA even high flow cats are illegal. Replacing an OEM cat can only be done if its broken and warranted.
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It'll only be illegal if you get caught with it on or if you fail a smog test. Cops can't see if your cat(s) is replaced on the road. The smog check technicians might be able to see if they lift it, but they won't care depending on where you go. As long as it passes smog, you should be good.
P.S. if all else fails, replace the aftermarket cats with the original OEM cat, same goes with any doubtable aftermarket parts. Always smart to keep all original parts