The extra weight of the 4.4 on the X5 was obvious in comparison to the 3.0. I'm sure on a E39 5 series the extra weight would be even more pronounced. The extra heft of the V8 will manifest itself as a car with more understeer & less inclined to change direction easily on tight turns.
Depends on what's more important to you. Handling or power.
2011 X5 M-Sport 3.5i
2010 Dodge Ram Hemi Sport
2010 GSX-R 750
2003 C5 Z06
LS7 427CI w/ECS Novi 2000 : Caravaggio Widebody and Full Leather & Alcantra Interior
903rwhp/815rwtq : 10.3@152mph
Last edited by tlaselva; 08-09-2006 at 10:01 PM.