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NGK BR9EIX Iridium Spark Plug with a solid top and core (not screwed on).
Solid Top/Core spark plugs are used in high-demand situations where reliability and performance are essential.
Iridium Plugs are the ultimate spark producer and are suitable for all Vittorazi engines.
Iridium plugs work straight out of the box and don't need gapping. Gapping can damage the fine electrode.
Beware of cheap counterfeit NGK Plugs being sold as original