How-To: Spark plug replacement on the WRX
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Join Date: Dec 2002
Location: Sacramento CA
Posts: 10,029
Car Info: 02 Impreza WRX sedan
Pretty much the same for all Subaru flat four engines that use the coil-on-plug design but STi owners feel free to chime in with additional steps, if there are any. Just verify the correct spark plug application for whatever model you own.
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