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HKS Super Fire Racing MR40XLB High Performance Spark Plug (Heat Range 8)

$47.00

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HKS Super Fire Racing MR40XLB High Performance Spark Plug (Heat Range 8)

$47.00

$47.00

The HKS Super Fire Racing MR40XLB is a high-performance spark plug engineered to handle the extreme combustion pressures and temperatures of tuned or forced-induction engines. As part of the HKS M-Series, this plug provides superior ignition performance, durability, and anti-fouling characteristics over standard factory components.

  • Iridium Alloy Center Electrode: The 0.6mm iridium alloy center electrode reduces voltage requirements and improves ignition performance and response.
  • Platinum Square Chip: The outer electrode features a platinum square chip for enhanced durability and long-term reliability under high-heat conditions.
  • Carbon Cleaning Thermal Edge: Deposits are burnt off the ceramic insulator via a specialized thermal edge to prevent carbon fouling during extended idling or low-speed driving.
  • Increased Strength: Optimized for high-load applications where standard plugs may fail.
  • Specifications: HKS Heat Range 40 (NGK 8 Equivalent), 12mm thread, 26.5mm reach, and 16mm hex size.
  • Part Number: MR40XLB

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