Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Remove STORAGE COMPARTMENT
Remove left/right FRONT SEAT
Remove GLOVEBOX
Remove SIDE TRIM PANEL IN FOOTWELL on left/right
Remove ACCELERATOR PEDAL MODULE

Version with central bass speaker:

Remove CENTRAL BASS SPEAKER TRIM on left/right

Remove holders (1) towards front.

Pull out air duct (2).

Fig 1: Pulling Out Air Duct

Courtesy of BMW OF NORTH AMERICA, INC.

Cut out carpet (1) at cutting edge (2) on left/right.

IMPORTANT: Risk of damage!
Make the cut as far as possible in the direction of the middle of the car to ensure that the cutting edges are covered by the storage compartment/panels.
Pay attention to cable(s) when cutting.

Fig 2: Identifying Carpet And Cutting Edge

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of damage!
Pay attention to cable(s) when cutting.

Cut out carpet (1) at cutting edge (2).

Guide cable back through carpet (1).

Feed out carpet (1) towards rear/top.

Fig 3: Identifying Guide Cable And Carpet

Courtesy of BMW OF NORTH AMERICA, INC.

Cutting edges (1) shown on removed carpet (2).

Installation:

Apertures (3) serve as alignment points for fitting the carpet (2).

Fig 4: Cutting Edges On Carpet

Courtesy of BMW OF NORTH AMERICA, INC.