



Great news – on this purchase, you'll enjoy a BuildBUX bonus of $0.30.
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
More Cashback
Get more cashback! Items are changing weekly. Anywhere from 1% to 20% Back in BuildBUX when you make purchases. Products
Free Money
Every month when you are charged your $4.98 subscription fee, you will get $15 in BuildBUX
Easy To Cancel
Cancel anytime, month to month terms.
Cashback
Get 1% back on every purchase on eligible brands.
Free
Completely free to use. Just place an order!

