RH Side

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
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Remove the resonator chamber. < Ref. to REMOVAL , Resonator Chamber. >
Remove the spark plug cords by pulling the boot, not the cord itself.

Fig 2: Removing Spark Plug Cords By Pulling On Boot
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Remove the spark plugs using spark plug sockets.

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