The D-9 with MW50 has been labelled 1945 since ages, and as it is a plane representative for D-9's in 45 there's little reason to change it. The MW50 kit was a rare item at best by late 1944.
If you have a problem with overheating, I suggest you try not to use WEP all the time, or fly the plane at higher altitudes where the lower outside temperatures help it to cool the engine. Diving at full throttle is a bad thing too, it was outright forbidden in the pilot manual. You're over-revving the engine. 3300 was the absolute limit, check how your rpm's are in the dive.
How much data do you have on the D-9 with MW50?
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