HKS Super Fire Racing M45i Iridium Spark Plug (NGK 9, ISO) - 10 Pack

The HKS Super Fire Racing M45i is an ISO-type iridium spark plug with an NGK 9 equivalent heat range, for tuned Japanese turbo and naturally aspirated engines (RB, SR, VG, Z32, and similar) using an ISO φ14 seat. The 0.6 mm iridium center electrode and platinum-chip outer electrode lower firing voltage for strong ignition under high boost or lean conditions, with thermal-edge anti-fouling. Sold as a 10-pack (wholesale case); a typical engine needs one plug per cylinder.

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