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NGK Iridium IX spark plugs are engineered for high ignitability and durability in modified or performance-oriented engines. The fine iridium center electrode significantly increases wear resistance versus platinum, and the tapered ground electrode enhances starting, idle smoothness and throttle response. Trivalent plating provides anti-corrosion and anti-seize benefits; these plugs are positioned as an upgrade from conventional nickel-alloy OE plugs.
NGK Iridium IX Spark Plug Box of 4 (ZFR6AIX-11S)
