Installing sill section
WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
Apply K5 ADHESIVE to bonding surfaces (1).
Install new part and reinforcement plate and weld in place.