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NGK Iridium Stock Heat Range Spark Plug 15-17 WRX Grimmspeed Lightweight Battery Mount Kit 08-17 WRX / 08-17 STI Okada Projects Plasma Direct Coil Packs 15-17 WRX
15-17 WRX Direct Fit Plug 2 Year Odyssey Warranty the purchased through Defined Performance. Increases combustion