HKS Super Fire Racing M40G Spark Plug Single (M40G)

Engineered for motorsport and high‑performance street applications, this HKS Super Fire Racing M40G spark plug delivers reliable ignition for demanding driving conditions. The M40G is offered as a single unit for targeted replacement or tuning, providing consistent spark performance in racing engines and modified setups. Ideal for enthusiasts and professional tuners seeking a purpose-built spark plug from the Super Fire Racing line, it supports precise combustion control and repeatable starting across aggressive duty cycles.