The HKS Super Fire Racing M50HL is an HL-type iridium spark plug with an NGK 10 equivalent heat range — the high heat-range option for heavily tuned engines. With its M12 long-reach, 14 mm hex design, it fits the Nissan GT-R R35 (high-tune setups) and Toyota 86 / Subaru BRZ (FA20), where the colder heat range controls detonation under high load and boost. The 0.6 mm iridium center electrode and reinforced outer electrode provide steady ignition at high RPM. Sold individually.
| Product Line | Super Fire Racing M-Series |
| Heat Range | NGK 10 equivalent (high tune) |
| 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 GT-R R35 (high tune); Toyota 86 / Subaru BRZ (FA20) |
| Quantity | Single plug |
| Part Number | 50003-M50HL-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.
