Take your ignition performance to the professional level with the HKS M45G Super Fire Racing Spark Plug. This high-performance Iridium-Platinum plug is engineered for extreme tuning applications, featuring an NGK Heat Range 9 equivalent.
The "colder" heat range of the M45G is specifically designed to dissipate heat rapidly, preventing catastrophic engine knock and pre-ignition in high-boost turbocharged or nitrous-fed engines.
Colder Heat Range (NGK #9): Essential for high-horsepower builds to prevent electrode melting and engine detonation under sustained high load.
0.6mm Iridium Alloy Center Electrode: Drastically reduces the voltage required for ignition, ensuring a strong, concentrated spark even in high-compression or lean-burn environments.
Platinum Ground Electrode: Features a square platinum chip for superior durability, maintaining a consistent spark gap over a long service life.
Anti-Vibration Design: The shortened outer electrode is reinforced to withstand the extreme vibrations of high-RPM performance engines.
Carbon-Fouling Resistance: Built-in "Thermal Edge" technology helps discharge carbon deposits during low-speed driving, preventing misfires before they happen.
| Attribute | Detail |
| HKS SKU | 50003-M45G |
| Plug Type | G Type (Standard Reach) |
| Heat Range | NGK #9 (Performance Colder Plug) |
| Thread Size | $14\text{mm} \times 19.0\text{mm}$ |
| Wrench Size | $20.8\text{mm}$ |
The HKS M45G is a specialty fitment for standard-reach performance heads, including:
Mitsubishi: Lancer Evolution 1 through 8 (4G63T), Galant VR4, Airtrek (CU2W)
Nissan: Skyline DR30 (FJ20E/ET), Pulsar GTi-R (SR20DET)
Toyota: Soarer (MZ10/M-TEU), Supra/Chaser (Non-VVTi 1JZ/2JZ high-boost builds)
Rotary Engines: Often used as a high-heat range leading/trailing option in modified RX-7 builds.
Note: Spark plugs are sold individually in Australia. For a Mitsubishi Evolution (4G63), please order Quantity: 4. For an RB26 or JZ engine, please order Quantity: 6.
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