Magnaflow does make OBD2 certified, carb compliant cats. They do come with a form ( carbon copies, in triplicate, no less ) That the installation tech has to fill out for you, basically saying that the car is A. old enough or B. has enough miles on it to make getting a new cat beneficial, and then you have to keep a copy of said form, as does the shop, for perusal by agents of the nanny state.
They are actually fairly affordable though, surprisingly. I can get pretty good prices on them generally through a supplier we use at work, so let me know and ill see what i can do. (Just need a general application, pref. make model, but can also use dimensions )
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