Dont know really though not many play multiplayer espically with all the modded versions running about.
There used to be a subforum for multiplayer but I cant seem to find it now.
I remember them talking about some Himachi thing.
I will try to find it and add a link for you.
Here it is theres a few sticky topics to help you get started. Good luck !
http://www.subsim.com/radioroom/forumdisplay.php?f=220