Take a ride in Chicago. Go to the baseball arena, you can find it at the top of the map. When you get there, get out of your car and go buy a ticket. Then the gate on the other side of the stadium will open up and it will say that you found a secret area. Get into the stadium and walk up the stand. Continue to the right and you will find a yellow sportscar whith black stripes. You have to press the button to open the gates. You can choose this car the next time you want to take a ride in Chicago.