There was a guy with two of them at a local bracket race year before last. They had supercharged 5.0 coyote engines in them. I drove into the pits and people were warming up cars, working on them etc. This guy was standing there drinking coffee. I want to say one of them was dialed sub 4.50 and the other one in the higher 4s. Sounded very docile in the pits but came right to life in the burnout. I imagine that is an incredibly low maintenance setup.