A: Removal

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the ground cable from battery.
Remove the high-mounted stop light. < Refer to REMOVAL , High-mounted Stop Light. >
Remove the rear gate trim. < Refer to REMOVAL , Rear Gate Trim. >
Remove the nuts.

Fig 1: Locating Roof Spoiler Mounting Nuts
Courtesy of SUBARU OF AMERICA, INC.
Open the caps (1), and remove the bolt inside.

Fig 2: Identifying Roof Spoiler Caps
Courtesy of SUBARU OF AMERICA, INC.
Remove the clips (a) and (b), and remove the roof spoiler.

Fig 3: Identifying Roof Spoiler Clips
Courtesy of SUBARU OF AMERICA, INC.