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NGK Stock Heat Range Iridium Spark Plugs 06-14 WRX / 04-17 STI NGK 2309 1 Step Colder Iridium Spark Plug 06-14 WRX / 04-16 STI Grimmspeed Lightweight Battery Mount Kit 08-17 WRX / 08-17 STI
Set of 4 Plugs Ideal for increased boost. 2 Year Odyssey Warranty the purchased through Defined Performance.