HKS 50003-MR40XLZ Super FIRE Racing Spark Plug

The HKS Super FIRE Racing MR40XLZ spark plug is a high-performance racing spark plug designed for extreme motorsports applications. Engineered with advanced materials and precision manufacturing, this plug delivers superior ignition performance under high-boost and high-RPM conditions.

Key Features:

• Premium iridium center electrode for maximum durability and consistent spark
• Extended ground electrode design optimizes flame kernel growth
• Cold heat range ideal for turbocharged and supercharged engines
• Reduces misfires under high cylinder pressure conditions
• ISO thread size with M12 x 1.25 pitch
• Designed specifically for racing and high-performance street applications

HKS Super FIRE Racing spark plugs are engineered to withstand the extreme conditions of forced induction engines, providing reliable ignition even at elevated boost levels. The MR40XLZ heat range is optimized for aggressive tuning and race applications where conventional plugs would fail.