You can fit a lot of motors and ESC in it but it cannot handle a lot of power the center drive shafts are weak metal and you will have to do all three diffs immediately
I immediately swapped to a Noble receiver with gyro, Powerhobby Phantom tires (ordered GRPs) and put a protoform body on it. For the electronics I swapped in QS8 connectors, put in aluminum steering parts, Castle BEC, 45kg servo and car is a blast on our parking lot course. Still running stock esc/motor no issues so far. Will eventually go Hobbywing