Yeah, they are so much better with a manual, suits the car. Those that disagree just dont like the fact that they are better
No different transmission to the 4 pots, GS6-37BZ-TJES is 130 box (370Nm rated), shared with Z4 3.0Si and thats it. In saying that there will be a bunch that have slightly different ratios/bolt holes/input shaft dimensions that will/will not work (M54 E46 ZHP, Z4M etc all have GS6-37BZs)