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The NGK Iridium IX ZFR6FIX-11 is a single iridium spark plug with a 14mm, 1.25mm-pitch thread, a gasket seat and a 5k-ohm resistor. Its fine-wire iridium center electrode resists wear and holds a stable spark, and the copper core and alumina ceramic help pull heat away. Heat range 6 suits many stock and lightly modified gasoline engines, and NGK rates it for about 50k miles. Against platinum plugs it trades a shorter stated life for sharper ignition and better fouling resistance, which is why tuners and enthusiasts favor it.
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Enthusiasts and mechanics rate the Iridium IX line for smooth idle, clean starts and durability in tuned engines. Some note the higher cost per plug and the need to confirm the correct heat range and gap for their engine.
The NGK Iridium IX 6441 (ZFR6FIX-11) is a spark plug from the NGK IX Iridium Series, designed for performance enthusiasts. It has a fine wire iridium center electrode. Iridium alloy has a very high melting point, which suits high-performance engines.
The insulator is pure alumina silicate ceramic for strength and heat transfer. A copper core helps remove heat. Trivalent metal plating resists corrosion and seizing. Corrugated ribs help prevent flashover, and triple seals prevent leakage.
