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Still not that common to have the exhaust manifold cast into the head... although some cars are starting to do this. The first car I had with the is the first gen Honda insight.
But practically, your casting is getting kind of silly if you have the head, exhaust manifold, AND the turbo in there... Makes sense to me to the have the turbo unit separate, even if it's basically just bolted to the side of a cast-in manifold.
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