Is it possible to... ?

[gap]

Originally Posted by MiG-23Flogger

Is it possible to replace the Type VIIC/41 sub with a Type XXI one ? both in 3D perspective and in Performance ? instead of adding ?

Yes in theory. But, believe me, it would be a whole lot of work and I don't see it likely that in the near future someone will take on the task. Converting one of the imported ships/ AI subs to the GR2 format is in comparison a cakewalk, and no one dared to do it (which is a real pity by the way, because this is actually well within our reach)