Push your performance build to the limit with the HKS M45 Super Fire Racing Spark Plug. This JIS Type performance plug features an NGK Heat Range 9 equivalent, making it one of the "coldest" plugs available for extreme tuning. It is designed specifically to handle the intense cylinder heat and high boost pressures found in heavily modified JDM engines.
If your vehicle is running aggressive ECU maps, upgraded turbos, or seeing heavy track time, the M45 provides the thermal protection needed to prevent pre-ignition and catastrophic engine knock.
Extreme Heat Management (NGK #9): A "cold" plug that dissipates heat rapidly, protecting your engine during sustained high-load conditions and high-boost runs.
0.6mm Iridium Alloy Center Electrode: Requires less voltage to ignite, ensuring a consistent, powerful spark even in high-compression environments.
Platinum Ground Electrode: Features a square platinum chip to provide maximum durability and consistent performance over the life of the plug.
Anti-Vibration Short Tip: The outer electrode is shortened and reinforced to resist high-frequency vibrations at high RPMs, a common cause of failure in racing plugs.
Thermal Edge Technology: Signature HKS ceramic insulator design discharges to burn off carbon buildup, reducing the risk of misfires during idling or cold starts.
| Attribute | Detail |
| HKS SKU | 50003-M45 |
| Plug Type | JIS Type |
| Heat Range | NGK #9 Equivalent (Cold) |
| Thread Size | $14\text{mm} \times 19.0\text{mm}$ |
| Wrench Size | $16\text{mm}$ |
| Electrode | Iridium Center / Platinum Ground |
The HKS M45 is the preferred upgrade for many iconic JIS-spec performance engines:
Nissan: Skyline R32/R33/R34 (RB20/25/26), Silvia S13/S14/S15 (SR20DET), 300ZX (VG30DETT)
Toyota: Supra (JZA80), Chaser (JZX100), Soarer (1JZ/2JZ), MR2 (3S-GTE)
Mitsubishi: Lancer Evolution IV through IX (4G63T)
Mazda: RX-7 (13B-REW) — Note: Check specific rotary leading/trailing heat range requirements.
Purchasing Note: Spark plugs are sold individually in Australia. For a 6-cylinder engine (Skyline/Supra), please order Quantity: 6. For a 4-cylinder engine (Silvia/Evo), please order Quantity: 4.
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