This is a R5671A-9 NGK RACING SPARK PLUG R5671A9 NGK R5671A-9 ,NGK Spark Plugs , Item Under The Categories : Ignition, Secondary Ignition, Spark PlugNGK Racing Spark Plug, NGK Racing spark plugs are designed with extreme use in mind and meant to withstand the most grueling racing conditions. NGK Spark Plugs have been powering racing champions and can be found in every racing venue throughout the world. The center electrode of the NGK Racing spark plugs has special configurations and designs to ensure durability and ignitability. NGK Racing plugs bring ultra high performance in a variety of heat ranges. Special configurations are used for a wide variety of racing applications.