• Increased Ignition Performance
  Decreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure.
• Improved Durability
  New material and design improve durability which allows for use under hard combustion conditions like continuous high load during circuit driving or aggressive tuning.
  * Improper combustion condition and wrong heat range selection may cause damage to the spark plug.
• Decreased Carbon Deposits
  Thermal edge and spark support gap help prevent carbon buildup for better ignition under various combustion conditions

Features

• R35 GT-R stock's heat range is the same as NGK 8, NGK 9 to 86/BRZ, and the new HKS M50HL is the same as NGK 10. It's for a high tuning vehicles.
• Reinforced by making the outer electrode bigger(see the pictures below). Also could have a steady ignition and ignition speed at a high load and high RPM by putting the center electrode in the middle of the spark plug.
• Improved the anti-taint property by making thermal edge to prevent the carbon buildup which occurs for the tuned engines.