The HKS Super Fire Racing M35i is an ISO-type iridium spark plug with an NGK 7 equivalent heat range — the warmest M-series step, suited to mildly tuned or street engines that don't need a colder plug. The 0.6 mm iridium center electrode and platinum-chip outer electrode deliver strong ignition and long life, with thermal-edge anti-fouling. Sold as a 10-pack (wholesale case); a typical engine needs one plug per cylinder.
Specifications
| Brand | HKS |
| Product Line | Super Fire Racing M-Series |
| Heat Range | NGK 7 equivalent |
| Seat / Type | ISO type |
| Thread | φ14 x 19 mm |
| Hex (Wrench) | 16 mm |
| Center Electrode | 0.6 mm iridium |
| Quantity | 10 plugs (case) |
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