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@christianSpaceman
You post above suggests you'll be getting 375 -> 430 hp out of it.
I'd have thought there are pretty well-heeled Porsche fettlers around. Is there genuinely no standard way of safely getting an extra 55 hp out of a Porsche engine - like no ones ever done it in such a way that isn't a bit ropey?
Edit - I guess you've already answered this above. I'm surprised - it doesn't seem like that big a power boost for the work required.