The HKS Super Fire Racing M40XL is an XL-type iridium spark plug with an NGK 8 equivalent heat range, suited to the Hyundai Genesis Coupe 3.8L (Lambda V6). The M12 short-reach (26.5 mm) 16 mm hex design with a 0.6 mm iridium center electrode and platinum-chip outer electrode delivers strong ignition and durability for tuned and stock engines, 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 8 equivalent |
| Seat / Type | XL type |
| Thread | φ12 x 26.5 mm |
| Hex (Wrench) | 16 mm |
| Center Electrode | 0.6 mm iridium |
| Application | Hyundai Genesis Coupe 3.8L |
| Quantity | 10 plugs (case) |
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