LOL... you are all talking jibberjabber....
In Belgium the GT12 class is just called "Mardave/Supastox unlimited"
It's just intended as a fun class for the winter as we are all buggy drivers. Just use your summer ESC - batteries or whatever you can find in your box. Some drive 1S, others 2S (hail to the Shorty) ESC and engine Free.... 6.5T, 8.5T, 13.5T, 21.5T ??? or whatever you want to use.....
The qualifiers will tell in what final you'll be in
