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NGK BKR7EIX iridium plugs in heat range 7, sold as a set of four. The iridium center electrode resists oxidation and erosion better than platinum and needs less voltage to fire, which helps turbocharged engines stay smooth under boost. Heat range 7 runs one step colder than stock, so they suit modified Subaru EJ20 and Audi/VW 2.0 TSI/TFSI builds pushing roughly 100 hp over stock. They are not pre-gapped, and the fragile iridium tip rules out slide-type gappers.
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These NGK iridium spark plugs are heat range 7, which is one step colder than the factory plug on the Subaru engines listed below. One step colder plugs are recommended for heavily modified cars, including those making about 100 horsepower more than stock. On the Audi and VW engines listed, heat range 7 is the factory heat range.
Iridium has a higher melting point and more durability than platinum. The center electrode resists oxidation and erosion. The plugs are designed for improved ignition, resistance to fouling and a lower required voltage. A new metal shell plating process improves corrosion resistance.
The plugs are not pre-gapped. Iridium plugs can run a larger gap with less voltage, and the gap can be reset to correct a misfire or tune the spark. Do not use a slide-type plug gapper, because it will damage the fragile iridium tip.
