1 Pack NGK 3657 Laser Iridium Spark Plugs IZFR5K11 The NGK 3657 Laser Iridium Spark Plug (IZFR5K11) is engineered for maximum durability and precision ignition in modern high-efficiency engines. 🔧 Iridium center electrode ensures high durability and spark strength. byJuly 4, 2026