Upper/lower set - must be rebuilt. I'm not sure which of the two went bad, but replacing these added a huge amount of power to my car (i.e. at least one is completely clogged).
Ebay item# is
170348423008, although they might take it down again. Ebay freaks out about advertising used cats, even if the listing clearly states it's only for recycling / professional rebuild purposes.
Used catalytic
