i just read through the california law, unless you have an early build/sell date, it seems you cat should have at least a 7 year 70k mile warranty? are you within that, or at least check what yours IS? then the dealer should put one in free.

I believe this one should/could work. would need to check part swap between vehicles further, but it would have the CA markings on it..:

MagnaFlow Catalytic Converters - 49-STATE & CANADA Catalytic Converters For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles