13...... Remove the intake port (N63 B40/B44 O 1)

Necessary preliminary tasks: 

- Remove TRAILING LINKS on left and right

Picture describes the left side, the procedure for the right side is identical.

Press in latch mechanism (1).

Feed out intake duct (2) towards top.

Fig 1: Pressing-In Latch Mechanism And Feeding-Out Intake Duct Toward Top

Courtesy of BMW OF NORTH AMERICA, INC.

Press in latch mechanism (1).

Detach intake port (2) towards rear and remove.

Fig 2: Detaching Intake Duct Toward Rear

Courtesy of BMW OF NORTH AMERICA, INC.