This thing right here is the BMW 850CSi built for the '99 season of Japanese Grand Touring Championship (called Super GT these days) to compete in the GT500 class. Heavily inspired by Honda NSX of '98-'99 seasons and numerous of other JGTC cars. Given that Sega never ran a car in Super GT, this livery is completely fictional (just as the car itself), but fits in the time period so everything should make a bit of sense.