The problem they will need to overcome is at aprox 185 mph the air bubble they will be pushing will start to lift the car then the car will start spinning the rear tires also known as reaching your terminal velocity. Keeping the car very low and covering the nerf bars will help a bunch

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Re: The World's Fastest Sprint Car
 

Now this is more like it.

http://www.youtube.com/watch?NR=1&v=...Q&feature=fvwp