RH Side

Disconnect the ground cable from battery.
Remove the engine control module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC) >Engine Control Module (ECM)> REMOVAL .
Disconnect the connector from ignition coil.
Remove the ignition coil.

Fig 1: Locating Ignition Coil Bolts (RH Side)
Courtesy of SUBARU OF AMERICA, INC.
Remove the spark plug with a spark plug socket.