HKS 50003-M40IL M-Series Super Fire Racing Spark Plug

HKS S-Series Super Fire Racing Spark Plugs are high performance Iridium plugs designed to handle advanced levels of tuning and still offer easy start-up and smooth idling. These spark plugs provide maximum spark output and efficient fuel combustion, utilizing the latest materials and technology for superior performance, extended life, and reliable start-up.

* 0.4mm diameter Iridium plug electrode core
* U-shaped grooved electrode
* S-Series Super Fire Spark Plugs are recommended for smooth cold starting, response and acceleration.

*M-Series Super Fire Spark Plugs*

HKS M-Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti-carbon build-up. These spark plugs are designed to give you consistently reliable combustion, increasing both performance and fuel efficiency.

* 0.6mm Iridium Alloy Center Electrode
* Outer Electrode with Platinum Chip
* Short Type Outer Electrode (Anti-Vibration)
* Thermal Edge
* Spark Support Gap