Version 3 (E53):
WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Turn fasteners on acoustic cover 90° counterclockwise.
Remove acoustic cover.
Remove sealing caps on covers of ignition coils.
Release nuts.
Remove covers on ignition coils.