2.0 Grinding outer shell and structure
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.
Always replace abrasives which have already been used to treat aluminum (risk of corrosion).
Do not grind the material thin.