Ki-87 had a turbo and had the max speed of 697km/h, more or less like P-47D, that's the base of my reasoning.
Juha
Mine as well. It was a true Japanese counterpart of the P-47. I'm surprised so many people see the Ki-84 as a Japanese Jug. The Frank is a sleek and beautiful plane. The P-47 is...well...a jug.