Unless they have changed their policy, there don't charge to run the track. You get three laps to strut your stuff. And don't even think about trying to pass the pace vehicles or they will usher you off. A lot of guys run the top of the track, and speeds are usually under 100. Slower vehicles usually run the apron. You can pass other carss, just not the pace vehicles.

I have done it 5 times all were fun except one. That was when I drove the 34. Me being over 6 feet tall combined with the 8 inch high windshield and the 4 inch chopped roof, doesn't provide you with much more than about 30 feet of front visibility, making the high banked turns rather hairy. The straights were great, but the turns were brutal. Much prefer driviing it with my 57.