The HKS Super Fire Racing M45HL is an HL-type iridium spark plug with an NGK 9 equivalent heat range (one step colder than stock), developed for the Nissan/Infiniti VQ35HR 3.5L engine. The M12 long-reach, 14 mm hex design matches the VQ35HR plug well, and the 0.6 mm iridium center electrode with platinum-chip outer electrode delivers strong, stable ignition for boosted or aggressively tuned setups while resisting carbon fouling. Sold individually.
| Product Line | Super Fire Racing M-Series |
| Heat Range | NGK 9 equivalent (one step colder) |
| 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 | Single plug |
| Part Number | 50003-M45HL-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.
