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The NGK Iridium IX spark plug offers high ignitability and long service life for modified and performance-minded engines. A fine iridium center electrode provides superior wear resistance—about six times harder than platinum—while the tapered ground electrode improves starting, idle quality and throttle response. Trivalent metal plating reduces corrosion and seizing; this plug aims to boost acceleration, fuel efficiency and durability compared with OE nickel alloy plugs.
NGK Iridium IX Spark Plug Box of 4 (ZFR5FIX-11E)
