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Motul Gear 300 Synthetic 75W90 ( 1 Quart ) Motorcraft Spark Plug Set Focus ST / RS NGK Iridium Spark Plug Set LTR71X-II 0.026" Focus RS
75W90 Synthetic OEM replacement One step colder
Ford Racing 2 Steps Colder Spark Plugs Focus ST/RS AEM Tru-Boost Gauge Type Controller 52mm 35 PSI
2 steps colder Displays boost up 35 PSI