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.