RH Side

Disconnect the ground cable from the battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the air cleaner case. < Ref. to REMOVAL , Air Cleaner Case. >
Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)

Fig 2: Identifying Spark Plug Cords
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Remove the spark plug with a spark plug socket.

Fig 3: Removing Spark Plug With Spark Plug Socket
Courtesy of SUBARU OF AMERICA, INC.