just know, those CARB legal cats are not CARB legal for your year vehicle. if any smog tech actually looks up the part number during an inspection, you will fail due to non compliant parts.
I ran into this very same issue with my volant intake. I bought the volant intake for the early year xterras and had a CARB EO number that only covered up to 2011, when I went to smog, the tech looked up the EO number and failed me because my year was not covered, I had to contact Volant to get a different CARB EO sticker which they did not want to give me because of the part number intake i had bought(I had to provide proof of purchase). i had to argue that the later year part number was the same exact part except for the giant hole they put in the box to clear the new horn location of the later year xterra. It was a pain in the ass and did not work, they would not give me the updated CARB sticker.