If you're having trouble at the rear of the Y-pipe, you're in for a real treat on the upper side of the cats. There's one bolt on each one facing the 'wrong' way that has to be broken from the top (engine bay) side with a long set of extensions. Use lots of penetrant (WD-40 or whatever your favorite is), let it soak in good.
As for the one you're having trouble with on the rear of the Y-pipe: Impact can help break a bolt loose too. If you don't have an impact wrench, get the socket or wrench on there solidly and then hit the wrench with a hammer. Or attach a cheater pipe (length of pipe, like a jack handle or something, that slips over wrench to give you more leverage).
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