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The NGK Iridium IX spark plug is a fine‑wire iridium ignition option aimed at drivers seeking sharper throttle response and durable service life. Iridium’s high melting point and a tapered ground electrode deliver improved starting, idling and acceleration while resisting fouling. Trivalent plating helps prevent corrosion and seizing. Recommended for modified or high‑performance applications or as an upgrade from OE nickel alloy plugs.
NGK Iridium IX Spark Plug Box of 4 (ZFR5FIX-E)
