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The NGK Iridium IX 93501 is a spark plug with a 0.6 mm fine-wire iridium center electrode, a tapered cut ground electrode and a 98 percent pure copper core. NGK positions it as an upgrade over OE nickel-alloy plugs for modified or high-performance engines. Owners often report smoother idle, quicker response and better fuel economy, though some notice no change and a few report worse mileage. The plugs are not pre-gapped to every vehicle's spec, and fitment varies by engine, so check the application before buying.
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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 describe easier starting, a smoother idle and slightly better economy after switching to these plugs. A minority notice no difference or worse mileage, and fitment and gapping complaints come up.
The NGK Iridium IX 93501 is a spark plug sold in a set of 4. It has a fine wire center electrode with a 0.6 mm iridium tip. The iridium alloy has a density 6 times that of platinum and a very high melting point.
The ground electrode has a tapered cut, which reduces quenching. The center electrode has a 98 percent pure copper core for heat dissipation and conductivity across a wide heat range. Trivalent metal plating provides anti-corrosion and anti-seizing properties and eases installation and removal.
These plugs are recommended for modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs.
