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First batch serial built J2M2 delivered December 1943. These would have been J2M2 Model 11. Max speed is listed as 370mph @ 19,360 feet. That doesn't seem very fast for a fighter aircraft powered by a 1,820hp engine. IMO Japan would be better served by reserving those powerful engines for the IJA Ki-84 and Ki-100 programs.
Krieghund, is the TAIC document available for dowload?
Pretty big priced, but I reckon that's how it goes. Thanks anyway.
I have included copies of the TAIC and ATAD reports of the J2M series as evaluated by the allies.