Necessary preliminary tasks

WARNING: This page is about a different car, the 2011 BMW M3, 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.

Remove FRONT SEAT
If necessary, remove PANEL FOR DOOR PILLAR (BOTTOM)

Release screws (1).

Remove central bass speaker trim (2) from floor trim (3).

Fold back floor panel (3) in direction of arrow.

Fig 1: Identifying Screws, Central Bass Speaker Trim And Floor Trim

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Floor panel shown removed for purposes of clarity.

Unfasten plug connection (1) and disconnect.

Unscrew nuts (2).

Feed out central bass speaker (3) in direction of arrow and remove.

Fig 2: Removing Central Bass Speaker

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Make sure seal (3) and rubber damper (4) are correctly seated on central bass speaker (1).

Insert central bass speaker (1) with guides (2) exactly in frame side member.

Fig 3: Identifying Central Bass Speaker, Guides, Seal And Rubber Damper

Courtesy of BMW OF NORTH AMERICA, INC.