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Ngk 9356 Iridium IX Spark Plugs - R0451B-8 drive-chains-420 2009 Gas Gas Enducross ECSpark Plug Code: R0451B 8 Fine Iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for todays high tech, high performance engines. Trivalent Metal Plating superior anti corrosion and anti seizing properties. Outstanding acceleration, high fuel efficiency and durability. Ultimate design, technology and performance.