I haven't tested this in the game yet, to see if the data on the webpage correlates to the game data, but on the P-51D page it says:
"Max Permitted Airspeed- 505 MPH"
Is this TAS or IAS? What alt is this at? And what is the source of that data?
I also find it interesting that according to this, the F4U (516) could outdive a P-51 (not that it isn't true... just that it is surprising, as late 1944/1945 P-51s along with the Spitfire had some of the highest mach numbers recorded for a prop aircraft). Fwiw, the F4U-1D vs P-51D tests specifically note that the P-51D outdived the Corsair.
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SnakeEyes
o-o-o-
=4th Fighter Group=