Years ago I saw Eldora run out of ambulances, it turned into a long night.
For you mini sprint guys, if you don't check helmet ratings, I'd do it at Eldora. Say what you will about the Burg, but you'll be going quicker at Eldora.
Blowing engines, woree out parts , whatever, just don't skimp on the safety gear. One week in ICU will buy you 5 or 6 cars. COMPLETE CARS.