WARNING: This page is about a different car, the 2003 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
Install in the reverse order of removal.
Tightening torque:
19 N.m (1.9 kgf-m, 13.7 ft-lb)
Fig 1: Identifying Intake Duct To Intake Manifold Bolt