The P51 Mustang and Fw 190 Dora 9 are surprisingly close in performance. It' surprising because the Mustang had a lot of advantages in supercharging, fuel, charge cooling, and a big edge in production quality, but the Dora comes through with displacement, RPM, MW50 and a decent airframe.

I think just about every single article or video about the P51 talks about how the installation of the Merlin engine turned it into a great fighter. That's not false, but there is a lot more to it, and the US contributions to the Merlin side of the story are almost never mentioned. I'll address some of that here.

The video was getting too long, which happens a lot, so I only covered speed and engine power. If the video does well, I'll make a follow up covering climb, turn performance and other factors.

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Corrections and Additions:

North Korea uses meters for altitude, I simply forgot about that country

Carb heat kills performance. I was speaking from the top of my head in general terms and not in reference to a specific fighter. For Merlin or Allison powered planes it's not really a factor. That said, fuel injected engines have an advantage in that they don't need carb heat, either as something selectable by the pilot or a source of heat that runs all the time to prevent icing.