For the tuners race I used the car I won in the Japanese Championship, it was an RX-7 racecar, thats all I remember. Anyway, it was borderline rediculous, I won the first race by about 45 seconds. I decided to B-spec the rest of the races so I wouldnt waste my time, and even the computer won by at least 30 seconds. I dont believe I put any upgrades in it either, maybe some nitrus, but thats it.