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13 71 170 Removing and installing/replacing rear air duct

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:

Risk of damage  through lever action at the top on the air duct!

Air duct may break!

Necessary preliminary tasks: 

Unlock and disconnect line (1).

Unlock connector (2) and remove.

Release quick-connect coupling (3) by turning lock and detach.

Fig 1: Identifying Line, Connector And Quick-Connect Coupling
G05502109Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Turn lock (1) until arrow markings are flush.

Fig 2: Identifying Lock
G05502110Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT:

Do not detach air duct in upward direction.

Risk of damage! 

Air duct may break!

Release screw (1).

Tightening torque 13 71 3AZ .

Release screw (2) and remove bracket (3).

Tightening torque 13 71 8AZ .

NOTE: Illustration with engine removed.
Fig 3: Identifying Screws And Bracket
G05502111Courtesy of BMW OF NORTH AMERICA, INC.

Pull off air duct (1), feed out and remove.

NOTE: Illustration with engine removed.
Fig 4: Pulling Off Air Duct
G05502112Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Check sealing ring (1) for damage and replace if necessary.

Make sure sealing ring (1) is correctly seated in air duct (2).

Fig 5: Identifying Sealing Ring And Air Duct
G05502113Courtesy of BMW OF NORTH AMERICA, INC.