Compared across 4 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The NGK Iridium IX is an upgrade spark plug with a fine iridium center electrode and a tapered ground electrode. It is aimed at drivers who want sharper throttle response and easier cold starts than standard copper or platinum plugs give. NGK is the largest OEM plug supplier, so fit and heat range match factory specs for Peugeot and Ford engines. It is a wear item, not a power adder: expect smoother running and longer service life, not a measurable horsepower gain.
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Store links may earn us a commission. Some prices via Klarna.
Lowest price we've seen: $9.72 on Nov 10 at Sixity. Tracked across 4 stores since Nov 10.
Owners and mechanics rate the Iridium IX highly for smooth idle, quick starts and long service life. Most criticism centers on value: the gain over cheaper plugs is small on a standard engine, and some buyers received counterfeit plugs from third-party sellers.
