What parts are needed to make this work? The tranny is from a s52(obd2) and is 5 speed. Can/do I have to use the tranny computer from the m3? Will the drive shaft fit?

Its a wiring nightmare and has never been done to the best of my knowledge.

I thought someone here had a m3 auto(engine+tranny) swap in thier touring?

Whackamac has got an M3 motor mated to a stock M50 auto tranny.

http://forums.bimmerforums.com/forum/showthread.php?t=779719&highlight=s50