Impreza GT F4-2.5L Turbo (2009)
11) Extract the companion flange using ST.
ST 399703600 PULLER ASSY
12) Remove the oil seal using ST or screwdriver.
ST 398527700 PULLER ASSY
13) Install a new oil seal using ST.
ST 498447120 INSTALLER
14) Install the companion flange.
NOTE:
Use a plastic hammer to install companion flange.