HKS SUPER FIRE RACING M45iL
HKS SUPER FIRE RACING MR45XLZ
HKS SUPER FIRE RACING M40iL
HKS 08 Lancer Evolution GSR/MR M-Series Spark Plugs (Heat Range 9)
HKS SUPER FIRE RACING MR45HLZ
HKS Rotary Applications M-Series Spark Plugs Heat Range 10.5
HKS SUPER FIRE RACING M50HL
HKS SUPER FIRE RACING M45RE
HKS Nissan/Infinity VQ35HR M-Series Spark Plugs (One Step Colder)
HKS 10 Hyundai Genesis Coupe 3.8L M-Series Spark Plugs (Heat Range 8)
HKS SUPER FIRE RACING M40LF
HKS Nissan/Infiniti VQ35HR M-Series Spark Plugs (Stock Heat)
HKS SUPER FIRE RACING M35LF
HKS General Application M-Series Super Fire Racing Spark Plug
Cobb Subaru WRX/STI/Legacy GT/FXT 2.5L Spark Plugs 4pk (Must Be Purchased w/Power Packages ONLY)