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I wouldn't re-port a Type R head, of course, but that's about the only extra thing you'd have to do to the GSR head if your comparing the two. While the Type R intake manifold is shorter than the GSR intake manifold, and already ported, you'd probably be better off with a turbo specific intake manifold, in which case the one that comes with the Type R head would end up sitting in your garage anyway, just as the GSR intake manifold would.
Both heads have their plusses, but for the same amount of money you could have a head that is specifically set up for a turbo, versus the Type R head that would require extra money to accomplish the same thing.
It's all in your taste, but I'd still go for the GSR head, if for no other reason than the fact that it might be just a bit easier to find turbo specific parts for the GSR head than the Type R head.
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