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NGK Iridium IX spark plugs (box of four, XR4IX) use a fine iridium center electrode to deliver durable, consistent ignition for modified or high-performance applications. Tapered ground electrodes improve starting, idling and throttle response while offering superior anti-fouling. Iridium alloy's high melting point provides long life and helps improve acceleration and fuel efficiency compared with conventional plugs.
NGK Iridium IX Spark Plug Box of 4 (XR4IX)
