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-M50HL :
PLUG TYPE : HL TYPE
THREAD SIZE : φ12×26.5mm
WRENCH SIZE : 14mm
HEAT RANGE : EQUIVALENT TO NGK #10

HKS is the first to release the high heat range tuning spark plug M12 long reach HEX size 14 for 86, BRZ and GT-R to the market.

FEATURES
- R35 GT-R stock's heat range is the same as NGK 8, NGK 9 to 86/BRZ, and the new HKS M50HL is the
same as NGK 10. It's for a high tuning vehicles.
- Reinforced by making the outer electrode bigger(see the pictures below). Also could have a steady
ignition and ignition speed at a high load and high RPM by putting the center electrode in the middle of
the spark plug.
- Improved the anti-taint property by making thermal edge to prevent the carbon buildup which occurs for
the tuned engines.