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The NGK Iridium IX spark plug box of 4 is tailored for modified or high-performance use, offering outstanding ignitability and durability from its fine iridium center electrode. The tapered ground electrode improves starting, idling and throttle response while trivalent plating guards against corrosion and seizing. Backed by NGK’s premium ceramic insulator and copper core, these plugs help sustain efficient combustion and responsive engine behavior under demanding conditions.
NGK Iridium Spark Plug Box of 4 (BKR5EIX-11)
