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Update:
Yes, there are gaskets inbetween the manifolds. The Nissan dealer in town didn't have then nor did Autozone. I bought some Gasket material and made my own. That worked great. The large area on the Y-pipe had a hole under a non-removable heat sheild that leaked really bad. I chose the cheep fix for this and with the pipe hanging used a product called "muffler mender" and filled all the gaps around the heat sheild. Then wrapped with this muffler wrap. It is a "rock cast" style wrap that is still holding today. 100% fixed, unless it gives way later. The car is quiet as can be right now with no leaks and I'm only down $15. Thanks to everyone who has looked at this.
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