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NGK Iridium IX spark plugs are tuned for enthusiast and modified applications, delivering extreme ignitability, improved throttle response and durable service life. The fine iridium center tip resists wear and ensures a consistent spark, while the tapered-cut ground electrode improves starting, idling and throttle response. Iridium’s high melting point supports high-temperature engines and the design targets stronger acceleration and fuel efficiency benefits.
NGK Iridium Spark Plugs Box of 4 (BKR9EIX)
