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【SUPER FIRE RACING M Series】 Ultimate spark plug "M". Ignitionability, durability, anti-insulation are all reinforced. HKS has made the best plug for both tuning engines and stock engines. Features 0.6mm...

【SUPER FIRE RACING MR Series】 Ruthenium Electrode M12 Long Reach High Heat Range Tuning Sparkplug with Protruding Electrode Concept and Features M12 Long Reach Sparkplug with proturding electrode for such...