In the NMRA Coyote class, the engines are factory sealed by Ford, and all cars have the exact same tune in the ECU (they flash them in the lanes). You have the choice between 4spd manual with a diaphragm style clutch or a C4 automatic. Both run at 3100lb on a .400 tree. You can run a 'tamer with the manual/diaphragm, or you can do pretty much anything you want to the C4/converter including a brake. There are no competitive automatic cars in the class, every event so far this year was won by a manual car using a 'tamer.