HKS 50003-M40XL Iridium M-Series Super Fire Racing Spark Plug

The HKS M-Series Super Fire Racing Spark Plug is a high-performance iridium spark plug engineered for enthusiasts running advanced engine tuning while maintaining reliable ignition and durability. Featuring a 0.6mm iridium alloy center electrode and outer electrode with platinum chip, this plug delivers superior ignition performance and exceptional resistance to carbon buildup under high load conditions.

Key Features:

• 0.6mm iridium alloy center electrode for concentrated spark energy and extended service life
• Outer electrode with platinum chip for enhanced durability and consistent performance
• Short-type outer electrode design provides anti-vibration characteristics
• Thermal edge technology optimizes heat dissipation
• Spark support gap ensures reliable ignition under extreme conditions
• Iridium's 2454°C melting point withstands high compression and minor detonation
• Nickel-coated housing prevents premature deterioration

The M-Series is specifically designed for modified engines operating under high load, delivering reliable ignition, exceptional durability, and superior resistance to carbon fouling. The ultra-fine iridium alloy electrode concentrates spark energy while maintaining longevity that conventional electrodes cannot match. Ideal for turbocharged, supercharged, and high-compression naturally aspirated applications.

Note: Spark plugs are sold individually. Verify required heat range and quantity for your specific application.