HKS Spark Plug Superfire MX40XL-MX45XL

HKS Spark Plug Superfire MX40XL-MX45XL

HKS Super Fire Racing Spark Plugs - Hyundai


Hyundai 1.6Turbo and 2.0Turbo. Spark Plug replacement or upgrade. Ideal for minor bolt on modifcations and or tuned cars. Sold as a pack of x4. 


  • 0.6mm Iridium Alloy Center Electrode
    Iridium alloy center electrode reduces voltage requirement and improves ignition performance and durability.
  • Outer Electrode with Platinum Chip
    The outer electrode incorporates a square platinum chip which improves durability, and combining with the iridium center electrode boosts ignition performance.
    The outer electrode features a shortened tip design and tapered shape while maintaining the necessary space for proper ignition.
  • Short Type Outer Electrode (Anti-Vibration)
    The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves longevity of the outer electrode.
  • Thermal Edge
    After long idling or under various combustion conditions, carbon buildup can occur causing misfires. The thermal edge of the ceramic insulator discharges to help decrease carbon deposits.
  • Spark Support Gap
    Discharge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup.
  • 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.


Select your range:

(Standard is  NGK Heat-7)

M40XL (NGK Heat-8/Denso24) ideal upgrade


M45XL (NGK Heat-9/Denso27) ideal for tuned cars

  • Vehicle Fitment

    All Hyundai turbo, 1.6 & 2.0L

Choose Your Plug Range