The HKS Super Fire Racing M45 is a JIS-type iridium spark plug with an NGK 9 equivalent heat range, a broad-application plug for tuned Japanese turbo and naturally aspirated engines (RB26/RB25, 1JZ/2JZ, and similar) using a JIS φ14 gasket seat. The 0.6 mm iridium center electrode and platinum-chip outer electrode lower firing voltage for strong ignition under high boost or lean conditions, with thermal-edge anti-fouling. Sold individually.
| Product Line | Super Fire Racing M-Series |
| Heat Range | NGK 9 equivalent |
| Seat / Type | JIS type |
| Thread | φ14 x 19 mm |
| Hex (Wrench) | 16 mm |
| Center Electrode | 0.6 mm iridium |
| Quantity | Single plug |
| Part Number | 50003-M45-1 |
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.
