omg come on man, http://forums.nasioc.com/forums/show...php?p=15812529
read that. sti is true awd with diffs in front, read, and middle. wrx 02-07 i believe is an open fron dif, has a dif in the center and read. 08+ wrx is open front and rear dif, has a center dif. did this to reduce stress on the transmission.