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Its common for the rear exhaust studs to snap off and causing it to leak exhaust. The manifold have not been a problem. Did you have the dealer replace under warranty? The reason i ask, in california there is a 8/80 emission warranty and that would be covered . There is an updated exhaust gasket that is thicker than the factory. That make up for warpage,
Master tech is right on. Busted manifold bolts are a common problem. A cracked manifold is not as common, but it does happen. Are you possibly confusing a bolt and gasket replacement for a manifold replacement?
I have an 05 4.7 and have a cracked manifold. But the dealer claims it is covered under the federal emissions warranty (7 year/70k) and is replacing it for me.