HKS Super Fire Racing Spark Plug M40HL

HKS Super Fire Racing Spark Plug M40HL

- Type: Iridium Spark Plug

- Heat range: NGK #8 equivalent

- Thread: M12

- Thread length: 26.5mm

- Socket size: 14mm

- Sold individually

- Made in Japan by NGK for HKS 

- HKS part no. 50003-M40HL

Compatible with a wide range of vehicles, for full compatibility with your engine, please refer to the HKS Super Fire Racing Spark Plug Application Chart.

The HKS Super Fire Racing M Series spark plug is designed as the ultimate high-performance spark plug for both tuned and stock engines. They combine advanced materials and engineering to improve ignition performance, durability, and resistance to carbon buildup under demanding driving conditions.

Each plug features a 0.6 mm iridium alloy center electrode that reduces the voltage required for ignition while improving spark strength and longevity. The outer electrode incorporates a square platinum chip for increased durability and enhanced ignition performance when paired with the iridium center electrode.

Thanks to its improved materials and construction, the M Series provides reliable performance in harsh environments such as high boost pressure, lean mixtures, and sustained high-load driving like track or circuit use.

For more information visit https://www.hks-power.co.jp/en

HKS Super Fire Racing M Series Chart