Man the sound of those Merlins there is nothing like it. What a brilliant engine. Some seriously beautiful aircraft at least to my eyes. I remember when I was a kid living north of Adelaide and squadron of P51's flew over heading north to the local military airfield now named Edinburgh, probably was then too, but cannot remember. All I can remember is the sound of those Engines, pretty sure they were Merlins, although I think they had Allison engines as well in the P51 at some time.