Look here:
http://www.realoem.com/bmw/enUS/partgrp?id=LM13-USA-05-2010-E89-BMW-Z4_35is&mg=16
Fuel tank is a saddle tank. The prop shaft runs right next to were the pump is mounted. Clever design
So looks like drop the exhaust then the prop shaft.
Just to gain access to the pump.
Actually a quick look elsewhere, looks like two trailing stiffing bars removed first, the exhaust, then heat shield then prop shaft.
http://www.realoem.com/bmw/enUS/partgrp?id=LM13-USA-05-2010-E89-BMW-Z4_35is&mg=16
Fuel tank is a saddle tank. The prop shaft runs right next to were the pump is mounted. Clever design
So looks like drop the exhaust then the prop shaft.
Just to gain access to the pump.
Actually a quick look elsewhere, looks like two trailing stiffing bars removed first, the exhaust, then heat shield then prop shaft.