Well, as I understand it, BoP is still using the Il-2 engine, which was optimized for a much lower, slower flight regime, as well as the unitank fuel system. The P-51D is really best when it's high, fast, and the seat tank is empty, none of which really work well in the current engine. I suspect we will have to wait until the BoB engine before we have a good P-51.
Addendum: It would be interesting to see how an Allison Mustang handled in the Il-2 engine, though.
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