51 12 ... Removing and installing/replacing bottom middle trim on rear bumper (M Technic aerodynamic kit)

WARNING: This page is about a different car, the 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Release screws (1).

Release catches (2) and remove trim (3).

Fig 1: Identifying Screws, Catches And Trim

Courtesy of BMW OF NORTH AMERICA, INC.