High-end V-12 engines in Ki-84/Ki-61 airframes

[spicmart]

What if you equipped hypothetically Japanese fighter airframes Nakajima Ki-84 and Kawanishi Ki-61 with high-end V-12 engines like the Rolls Royce Griffon, DB 603 or Jumo 213?

 

[Hardrada1955]

Or this...
https://airandspace.si.edu/collecti...n-no-1-inverted-v-12-engine/nasm_A19771008000

 

[lancer21]

This perhaps should be in the alternate history section? At any rate, speaking of japanese V-12s, i wonder if Kawasaki could have further developed their Ha-9 engine in the same way the soviets did with the Mikulin AM-34 et seq, both of which tracing their lineage to the BMW-VI. Mikulin got 2000HP out of the later AM-42, if Kawasaki gradually evolves the Ha-9 into say a 1500HP plus class engine, entirely adapted to japanese manufacturing techniques/resources, maybe the could have avoided some of the manufacturing and reliability issues the Ha-40/Atsuta experienced, due to the german design requiring specialist machine tools, tight tolerances, advanced materials etc.