Almost every tank is overpowered stock:
1!? several, this update has many OP tanks. Type 10, M48, T-54, Type 60, Chieftain, Stock T-72, and 50-55 C1
All Russian mediums (except T-90 and Black Eagle)
All high level tanks with stock level at and below 50.
All artillery (Well, their all overpowered maxed as well)