HKS M-Series Super Fire Racing Spark Plugs (Set of 10) M50HL WRX 15-21 | 50003-M50HL catless Dyno testing resulted in an
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Description
HKS M Series Super Fire Racing Spark Plugs (Set of 10) M50HL WRX 15 21 50003 M50HL catless Dyno testing resulted in an Dyno testing resulted in an increase of 11 WHP and 32 FT LBS's increase in torque With an installation time of under an hour