The HKS Super Fire Racing MR45XLZ is a Ruthenium-alloy spark plug from the MR series, an NGK 8 equivalent heat range XL-type plug developed for the Suzuki Swift Sport ZC33S 1.4 turbo and similar M12 long-reach protruding-electrode applications. The ruthenium center electrode improves fuel burn for quicker throttle response, smoother idle, and better cold starts, with extended service life over standard plugs. Sold individually.
| Product Line | Super Fire Racing MR-Series |
| Heat Range | NGK 8 equivalent |
| Seat / Type | XL type (M12 long reach, protruding) |
| Thread | φ12 x 26.5 mm |
| Hex (Wrench) | 16 mm |
| Center Electrode | 0.6 mm ruthenium alloy |
| Application | Suzuki Swift Sport ZC33S (and similar) |
| Quantity | Single plug |
| Part Number | 50003-MR45XLZ-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.
