PLUGS SOLD IN SINGLES

APPLICATION LIST HERE

HKS SUPER FIRE RACING (M SERIES) PLUG TYPE HERE

Improved ignition performance, durability and anticarbon build-up. The Ultimate sparkplug for increasing performance of tuned or stock engines. 

0.6mm Iridium Alloy Center Electrode 
Iridium Alloy Center Electrode reduces voltage requirement as well as improving ignition performance and durability. 
Outer Electrode with Platinum Chip 
The Outer Electrode incorporates a square platinum chip which improves urability, and when combined with the iridium center electrode boosts ignition performance. 
The Outer Electrode features a shortened tip design and tapered shape while 
maintaining the necessary space for proper ignition. 
Short Type Outer Electrode (Anti-Vibration) 
The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves longevity of the outer electrode. 
Thermal Edge 
After long idling or various combustion conditions carbon buildup can occur causing misfires. The Thermal Edge of the ceramic insulator will discharge to help decrease carbon deposits. 
Spark Support Gap 
Discharges will occur in the Spark Support Gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup. 

Performance and Efficiency 

Increased Ignition Performance 
Decreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure. 

M50HL  heat range NGK10

M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load. 

Heat Range Conversion Chart 

HKS          25    30    35    40    45    50    52.5    55 
DENSO    16    20    22    24    27    31     32        34 

NGK            5    6      7      8      9    10     10.5     11

SUIT MODELS 

NISSAN SKYLINE R35 GTR

TOYOTA 86 T86 GT86
SUBARU BRZ
ZC6 , ZN6 - FA20 - 03/12 On