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I can't prove that the OEM ones that I put back on are the original ones, and it is illegal to buy used cats to put on your car.  I am sure that if I had clogged my original ones, put used ones on, and then went through smog I would have been all good.  But since I have gone through and didn't have ANY, I now have to show that I have them in place and they are new. 
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