Id like to add this, the "how to drain the STi 6MT"
http://forums.nasioc.com/forums/showthread.php?t=964993
took me a while to find it and its not listed in the main post.
drain gear oil from both A and B bolts, plug them , use the listed torque, then refill through the trany dipstick.
Now if I could only find the size of the rear diff top bolt