It's a Ki-61, the Japanese version of the Bf-109, more or less, for those who don't know. (If there are any of you left in this game... damn braniacs, I tells ya'!) It uses a licensed version of the DB 601 engine. The Japanese stressed manueverability, so they increased wing size to reduce the loading, did some other modifications.
It looks just like this in the dreaded (aka POS Ace) Fighter Ace, and is one of the better rides in that game.