After reading up a good bit (not just wiki!), the only more "sophisticated" thing i could come up with is maybe the drivers! If you've ever listened to those nascar boys talk, you'll know what i mean. The supercars seem to keep more towards the stock appearance of the vehicle, but both are engineering marvels. I find it quite interesting though that only ford & holden are what makes up the super cars. The super cars look to be slower, but i'm sure that just comes with the variations in tracks too. I'll have to watch a supercar race for sure now to get a feel for it. I'm just glad they are bringing something new to this place. They just voted yesterday to approve the city money for it, to free up the state funding. The damn hippies in Austin want to spend millions on bike lanes on roads which bring no revenue in return, yet want to throw out a project that will bring in hundreds of millions a year to central texas. Idiots.