PLEASE CHECK FITMENT BEFORE PURCHASE (https://www.hks-power.co.jp/en/product/plug/index.html)

Ignitionability, durability, anti-insulation are all reinforced. HKS has made the best plug for both tuning engines and stock engines.

CODE 50003-M40HL :
PLUG TYPE : HL TYPE
THREAD SIZE : φ12×26.5mm
WRENCH SIZE : 14mm
HEAT RANGE : EQUIVALENT TO NGK #8

CODE 500003-M45HL :
PLUG TYPE : HL TYPE
THREAD SIZE : φ12×26.5mm
WRENCH SIZE : 14mm
HEAT RANGE : EQUIVALENT TO NGK #9

APPLICATION : (https://www.hks-power.co.jp/en/product/plug/index.html)
Toyota
Nissan
Subaru
Lexus
Mazda

- 0.6mm Iridium Alloy Center Electrode
- Outer Electrode with Platinum Chip
- Short Type Outer Electrode (Anti-Vibration)
- Thermal Edge
- Spark Support Gap

Performance and Efficiency
- Increased Ignition Performance
- Improved Durability
- Decreased Carbon Deposits