fmugur:

Well, you will have to drop the transfer case to get the new (longer) front drive shaft in, according to both the supplier and others who have done it. Can't help you on how much else has to come out to get the transfer case out, but perhaps someone who has done it can chime in.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue