First talk to racer guy, and just watch the curly scene. After he will drive somewhere you grab any car I would recommend the red one to your left right as you leave the ally way. After you grab your car you follow the yellow highlight path. Now here is the hard part once you reach the race and it starts. You can't collide more than 5 times( like them crashing into you) and must come in first at the same time. Here's a tip if you need help take it slow and when you get a chance go for first. When your in first I would recommend using slow motion on corners or on a busy high way