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The NGK Iridium IX 94553 is a fine-wire iridium spark plug with a 0.6 mm center electrode, a tapered cut ground electrode and a solid copper core. NGK rates it as a step up from standard nickel-alloy plugs, aimed at modified or high-performance engines and at drivers replacing worn plugs in modern cars. Compared with platinum plugs, iridium tips last longer and fire more consistently, but the plugs cost more and the gains depend on the engine. Owners report smoother idle and quicker pickup; a few noticed no change, and one set wore badly by about 45,000 miles.
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Lowest price we've seen: $16.99 on Nov 10 at Advance Auto Parts. Tracked across 1 store since Nov 10.
Buyers mostly report smoother idle, quicker pickup and better fuel economy after fitting these plugs, and call installation easy. A minority saw no improvement, and one owner found the plugs in bad shape after about 45,000 miles.
The NGK Iridium IX 94553 is a spark plug sold in a pack of 4. It has a fine wire 0.6 mm iridium tip center electrode. The iridium alloy has a very high melting point, which suits modern high-efficiency engines and gives a stable spark.
The ground electrode has a tapered cut that reduces quenching. The center electrode has a 98 percent pure solid copper core for heat dissipation, conductivity and a wide heat range. The insulator is ceramic, and trivalent metal plating resists corrosion and seizing, which eases installation and removal.
These plugs are recommended for modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs.
