Brisk Iridium Performance P23 RR15BYIR-3 Spark PlugP23 RR15BYIR 3 Iridium Yttrium Brisk Performance Spark Plugs Brisk SKU P23 RR15BYIR 3 Parameters: Thread Diameter 14mm Thread Reach 25mm 1" Hexagon 16mm 5 8" Seat Type Tapered Design Iridum Yttirum Resistor Yes Projected Yes Heat Range 15 Brisk P23 RR15BYIR 3 Replaces: With very long lifespan, the P range Brisk spark plugs are the most modern design to fit modern highly efficient and stressed engines. The Iridium core center electrode is surrounded by

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