Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
It checks today's price at every store, compares the alternatives and answers in about a minute.
The NGK Iridium IX is an upgrade spark plug with a 0.6 mm fine-wire iridium center electrode and a tapered cut ground electrode. NGK rates it for modified or high-performance engines and as a direct upgrade from OE nickel-alloy plugs. The iridium tip resists wear far better than nickel, so the gap holds steady over a long service life, and the solid copper core spreads heat well. It is a common choice for tuned engines, turbo builds and drivers who want sharper throttle response; it costs more than a standard copper or platinum plug but less than some OEM iridium plugs.
In stock
Store links may earn us a commission. Price via Klarna.
Lowest price we've seen: $13.99 on Nov 10 at NAPA. Tracked across 1 store since Nov 10.
Owners and mechanics rate the Iridium IX highly for smooth idle, easy starts and long life, and many fit it as a routine upgrade. Some note the higher cost and warn that the fine tip bends easily if gapped carelessly.
The NGK Iridium IX is a spark plug with a fine wire 0.6 mm iridium tip center electrode. The iridium alloy is six times the density of platinum and has an extremely high melting point. The electrode is built for durability and a consistently stable spark.
The ground electrode has a tapered cut that reduces quenching, which improves ignitability, acceleration, fuel efficiency and durability. A solid copper core of 98% pure copper provides heat dissipation, conductivity and a very wide heat range. Trivalent metal plating resists corrosion and seizing, which makes the plug easier to install and remove.
It is recommended for modified or high-performance applications, or as an upgrade to OE nickel alloy spark plugs.
