Ford GT versus Gran Turismo 4

This has gotta be one of my dreams, to actually get out there on a real racetrack and compare GT4 with a real race car. Well any car should do, if you own a dodge viper in real life you should be able to take the viper out on the track and compare your times with your times in GT4. Looks like generally people go slower in real life than in the game, but you'd expect that because driving 250kmh over the crest of a hill in real life is a heap harder than in some game where if you slam into the wall it doesn't matter too much.