The Ki-100 Japanese fighter was capable of high-altitude interception of B-29s and is overall considered one of their best fighter aircraft of the war. It came about while refining the Ki-61 design with their newer, more powerful Homare engine, the engine and airframe both being available in early 1942. Suppose on a fluke someone decides to put the powerful engine in the Ki-61 airframe two years ahead of schedule - it does not win Japan the war but what effects does it have, if any?