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The NGK Iridium IX spark plug delivers high ignitability, strong throttle response and enhanced fuel efficiency for modified or high-performance use. A fine iridium center electrode and tapered ground electrode improve starting and idling, while iridium’s high melting point supports durability in hot-running engines. Trivalent plating reduces corrosion and seizing, making these plugs a durable upgrade from standard nickel alloy OE units.
NGK Iridium IX Spark Plug Box of 4 (KR7DIX-11S)
