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Product Fitment:
2015-2021 Subaru WRX
2013-2016 Scion FR-S
2013-2020 Subaru BRZ
2017-2020 Toyota 86
The HKS M50HL Super Fire Racing Spark Plug is a one-step-colder iridium plug engineered for high-performance engines under demanding conditions. Ideal for turbocharged or tuned applications, it offers enhanced ignition, reliability, and resistance to carbon buildup—perfect for performance enthusiasts pushing the limits.
Features:
Heat range equivalent to NGK 10 / Denso 31
One step colder than HKS M45HL for high-boost/tuned setups
0.6mm iridium alloy center electrode for improved spark and durability
Square platinum chip outer electrode boosts ignition reliability
Thermal edge design resists carbon fouling under aggressive combustion
Nickel-coated housing to help reduce risk of detonation
Ideal for turbocharged, supercharged, or track-driven engines
Sold individually — order 4 for a complete set
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