HKS SUPER FIRE RACING IRIDIUM SPARK PLUG 50003-M50HL

HKS Super Fire Racing Iridium Spark Plug — 50003-M50HL

HKS's M-Series iridium plug built for high-boost, tuned engines — including the Nissan GT-R R35 VR38DETT, where it runs two steps colder than the factory NGK 8 heat range. The M50HL is HKS's first M12 long-reach, 14mm hex plug in this heat range, matching an NGK #10 / Denso 31 equivalent for engines pushing beyond stock power levels