RH Side

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the resonator chamber, see REMOVAL , Resonator Chamber.
Remove the spark plug cords by pulling the boot. (Do not pull the cord itself)

Fig 2: Removing Spark Plug Cords By Pulling On Boot
Courtesy of SUBARU OF AMERICA, INC.
Remove the spark plugs with spark plug sockets.

Fig 3: Removing Spark Plugs
Courtesy of SUBARU OF AMERICA, INC.