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HKS Super Fire Racing MR 50003-MR40XLZ (Spark Plugs) | ITEM DETAILS | |
MR Series. Ruthenium Electrode. M12 Long reach high heat range tuning spark plug with protruding electrode. Inherits the best from existing M series and features ruthenium alloy electrode to provide a reliable spark for all vehicles, including vehicles with increased boost or lightly tuned vehicles. On top of extended lifetime, use of ruthenium alloy allows a better fuel burn, resulting in quicker throttle response, smoother idle and better cold starts. | $ 16.41 |