NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.. The improved throttle response, superior anti-fouling and high-ignitability makes Iridium IX® the ideal choice for any performance enthusiast. Iridium's high melting point is perfectly suited to today's high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability.. NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.. RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs. Trivalent metal plating for superior anti-corrosion and anti-seizing properties. BUICK LUCERNE 2009-08; CADILLAC DTS 2009-08, STS 2009-06, XLR 2009-06. Outstanding acceleration, high fuel efficiency and durability. Fine iridium tip ensures durable and consistent spark. NGK IX Iridium Spark Plug Box of 4 (TR7IX). NGK Iridium IX Spark Plug. Iridium IX Spark Plug. Spark Plug

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