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The NGK Iridium IX TR6IX is a fine-wire iridium spark plug aimed at tuned and high-performance engines, and it also works as an upgrade over stock nickel-alloy plugs. Its 0.6 mm iridium center electrode and tapered cut ground electrode are built for strong ignitability, easy starting and crisp throttle response. The trivalent metal plating resists corrosion and seizing in aluminum heads. Against platinum plugs it trades a shorter service reputation for sharper response; NGK's own Ruthenium HX sits above it for longer life.
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Owners of performance cars commonly fit these as an upgrade and report smoother idle and quicker throttle response. Some note the fine tip demands care during install and that they do not last as long as premium ruthenium plugs.
The NGK Iridium IX spark plug is designed for performance applications. It has a fine iridium wire center electrode that gives a durable, consistent spark. The iridium electrode is six times harder than platinum, and iridium alloy has a very high melting point.
A tapered cut ground electrode improves starting, idling and throttle response. The plug is built for high ignitability and resists fouling. Trivalent metal plating protects against corrosion and seizing.
It is recommended for modified or high performance applications, or as an upgrade to original-equipment nickel alloy spark plugs.
