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The NGK Iridium IX four-pack is engineered for drivers who want sharper throttle response and reliable ignitability. Fine-wire iridium on the center electrode and a tapered ground electrode improve starts, idling and acceleration while resisting fouling. Trivalent metal plating reduces corrosion and seizing, and the solid insulator and copper core support heat control for durable, consistent sparks in higher-demand applications and upgrades over nickel plugs.
NGK IX Iridium Spark Plug Box of 4 (TR55IX)
