WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Install in the reverse order of removal.
NOTE:
Use a new gasket.
Tightening torque:
9 N.m (0.9 kgf-m, 6.6 ft-lb)
Fig 1: Identifying Secondary Air Combination Valve, Air Duct, Clip, Gasket And Secondary Air Pipe