The HKS Super Fire Racing M40HL is an HL-type iridium spark plug with an NGK 8 equivalent heat range (stock heat) for the Nissan/Infiniti VQ35HR 3.5L engine. The M12 long-reach, 14 mm hex design suits the VQ35HR, and the 0.6 mm iridium center electrode with platinum-chip outer electrode provides strong ignition and long service life while resisting carbon fouling. A direct performance upgrade at the factory heat range. 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 8 equivalent (stock heat) |
| Seat / Type | HL type (M12 long reach) |
| Thread | φ12 x 26.5 mm |
| Hex (Wrench) | 14 mm |
| Center Electrode | 0.6 mm iridium |
| Application | Nissan / Infiniti VQ35HR 3.5L |
| Quantity | 10 plugs (case) |
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