As you enter your city make sure you build high residential zones and ensure that there is a lot of space for your Sims. Wait about a month or two. Go into Sim mode and choose a Sim. As you decide what house you want to move him or her into, make sure the wealth is at all 3 §§§ rather than § or §§. When in Sim mode, click on the little car out of your three choices. Then, click on "My Sim's Car". At the top should be three different selections of cars. The § means low wealth, §§ means medium wealth, and §§§ means high wealth. Click on the high wealth §§§. On the list, look for a red car labeled as "Exotic Red Sports car". This is the fastest road car you can drive that a Sim can own, the Lamborghini Countach.