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The NGK Iridium IX spark plug features a fine iridium center electrode and tapered ground electrode to deliver extreme ignitability, better throttle response and resistance to fouling. Iridium’s high melting point and durable tip yield long life and consistent spark, while trivalent plating helps prevent corrosion and seizing. Recommended for modified or high‑performance applications or as an upgrade from OE nickel alloy spark plugs seeking improved acceleration and efficiency.
NGK Iridium IX Spark Plug Box of 4 (ER9EHIX)
