The car with the highest top-end is the 300ZX. My friend and I got up to 265 mph and there was still plenty of more speed for the engine to put out, but the road curved :-( And also the best car in the game is the 240Z, costs a cool quarter mil, but once lightened to 1700lbs and pushing 650hp, the car goes from 60 to 240 in about 6 seconds, man :-)