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 individually.
| 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 | Single plug |
| Part Number | 50003-M40XL-1 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
