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2005
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Impreza WRX STi
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Repair and Diagnosis (Single Page)
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Engine Performance
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Ignition System
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IGNITION -- STi
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Spark Plug
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Removal
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Notes
Spark Plug: Removal: Notes
CAUTION:
All spark plugs installed on an engine, must be of the same heat range.
Spark plug:
NGK: ILFR6B