NGK IX Iridium Spark Plug (TR7IX) NGK3690

Designed for high-performance engines, the TR7IX Iridium plug ensures efficient combustion and maximum spark under pressure. Features & Benefits: ✓ Fine-wire iridium tip offers superior ignitability and lifespan ✓ Resists fouling under boost or high RPM ✓ Heat range 7 – ideal for mildly to heavily modified engines ✓ Thread Size: 14mm / Hex: 5/8 / Reach: 26.5mm Ideal For: Turbocharged or nitrous applications needing cooler heat range plugs