HKS 50003-M40I Spark Plug 8 for SUBARU EJ207/EJ205 / TOYOTA 1JZ/2JZ / PORSCHE 996T/997.1 Turbo

Description High-Performance Spark Plug for Turbocharged Subaru, Toyota, and Porsche Applications

The HKS Super Fire Racing M40i spark plug is engineered to deliver enhanced ignition performance under extreme conditions, making it ideal for high-output turbocharged engines. Designed with motorsport in mind, this Iridium-based plug ensures consistent spark stability, improved combustion efficiency, and superior durability even in heavily tuned setups.

• Optimized for turbocharged engines with increased cylinder pressure
• Iridium center electrode ensures high ignition performance and extended service life
• Designed to reduce misfiring under high-boost conditions
• Resistor-equipped to minimize electromagnetic interference

Specifications:

• Heat Range: 8
• Thread Diameter: 14 mm
• Thread Reach: 19 mm
• Hex Size: 16 mm
• Electrode Material: Iridium
• Resistor: Equipped
• Part Number: 50003-M40i
• Compatible Engines: SUBARU EJ207 / EJ205, TOYOTA 1JZ / 2JZ, PORSCHE 996 Turbo / 997.1 Turbo