If your x5 is equipped with a CD changer, it will be located behind the driver's side panel in the very back. This is not standard equipment, however.
The 2002 BMW X5 has a drag coefficient of .35 Cd.
The 2009 BMW X5 has a drag coefficient of 0.34 Cd.
The 2011 BMW X5 has a drag coefficient of 0.34 Cd.
The 2008 BMW X5 has a drag coefficient of 0.34 Cd.
The 2007 BMW X5 has a drag coefficient of 0.34 Cd.
The 2013 BMW X5 has a drag coefficient of 0.34 Cd.
The 2006 BMW X5 has a drag coefficient of 0.35 Cd.
The 2004 BMW X5 has a drag coefficient of .35 Cd.
The 2003 BMW X5 has a drag coefficient of .35 Cd.
The 2012 BMW X5 has a drag coefficient of 0.34 Cd.
The 2005 BMW X5 has a drag coefficient of .35 Cd.
The 2010 BMW X5 has a drag coefficient of 0.34 Cd.