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This DENSO Iridium Spark Plug, part code IWM31, is designed to deliver exceptional ignition performance. Its advanced iridium construction ensures a long service life and consistent spark, contributing to improved fuel economy and smoother engine operation. The IWM31 spark plug is built to meet the demanding requirements of modern engines. It provides reliable starting and consistent power delivery across various driving conditions. Trust DENSO for quality and innovation in ignition components. Key features include a fine-wire iridium center electrode for reduced voltage requirement and enhanced ignitability. The plug's robust design also helps to resist fouling and wear, ensuring optimal performance over its lifespan.