Well, I have been to a couple of air shows in my day and if the Horsemen ever come your way, Go see them ! You can also go to their site and sign up and watch some of their videos.
www.asb.tv/videos/view.php?v=022754bc
And these stunts are done at low altitude.
They are a Formation Acro team that flys 3 original unmodified P51's. Now you can't even do 5% of these stunts in Il2 1946 with a p51, and these guys are doing them in formation ! I mean come on.
Seeing is believing thats all there is to it, Even if you don't believe the aces that flew the p51 then, go to a air show and watch it for real. Then you'll understand how off the flight model is for the p51 in even il2 1946.
Desode