protege5 hatch

Hi All, So my catalyc converter has fouled, looking into Ebay there's a bunch that are cheap from Canada but are not "Legal" in California, anyone know why? I'm looking into the Walker 31642 direct fit, but its over $400! cheapest was on Amazon for $314 with Gaskets but I just don't have that...

2002 Mazda protege5 (email me for more pictures couldn't upload them) Uncertified (does not need much to certify) Asking for $2,850 OBO What has been replaced: New gas tank New mass air flow sensor New battery Oil sprayed every year E-test passed Come with two sets of tires: 16"...

i got rear ended, hatch is smashed shut. i tried looking for a carbon fiber one, no dice. so does anyone have one laying around they could sell me?? lol id HATE to have to fix it with bondo.