HKS Super Fire Spark Plug M45i (hks50003-M45I)

Regular price $23.97 USD Sale price $23.97 USD Regular price $23.97 USD
In Stock!
SKU: hks50003-M45I
Product Description

These HKS Super Fire Spark Plug M45i are Long Reach Types and use both Iridium and Platinum for the utmost performance for street and race applications. These plugs are recommended for reliable ignition, durability, and anti-carbon buildup under high load. These are the Ultimate spark plug for enhancing the performance of tuned or stock engines.


    • Improvement of ignition performance
      By reducing the required voltage, the ignition power is strengthened in a dilute air-fuel mixture or in a hard-to-burn environment such as under high boost. In addition, by securing the space volume around the electrodes, the combustion speed becomes faster, which leads to improvement of torque, response, and combustion efficiency.
    • Improved durability
      The strength of each part has been greatly improved by selecting materials and designing new shapes. It demonstrates its original performance even in more severe combustion conditions such as continuous high load operation such as circuit driving and tuning.
      * The plug may be damaged if it is not in the proper combustion state or if it is used with the wrong heat value selection.
    • Improved carbon stain resistance
      Prevents fog and smoldering, and promotes more reliable ignition in various combustion environments.


    • Sold per piece




    • 0.6mm iridium alloy center electrode Uses an iridium alloy center electrode
    • that reduces the required voltage and has excellent durability while improving ignitability.
    • Ground electrode with platinum square tip Abrasion resistance is improved and ignition resistance is improved by combining with the iridium alloy center electrode. In addition, the tip can be shortened to secure a space volume as well as a tapered shape.
    • Short type seismic ground electrode
      By shortening the length of the electrode and optimizing the cross-sectional shape, mass reduction is realized while increasing the cross-sectional coefficient. Contributes to improving the strength and durability of the ground electrode.
    • Thermoedge
      Carbon deposition caused by long idling and various combustion environments such as air ratio reduces insulation and causes a misfire. By providing a thermo-edge at the tip of the insulator, minute discharges are generated and the accumulated carbon is burned off, ensuring insulation at all times.
    • Auxiliary spark gap The gap between
      the insulator part at the tip and the ground electrode surface is narrowed to generate an electric discharge, which suppresses carbon deposition like the Thermo edge and prevents fog and burrs.

    To provide faster delivery and turn around time; Kami Speed ships products out from different warehouses throughout the United States. Usually averaging 1-4 business days for processing prior to shipping.

    Depending on the package, we ship using different carriers according to the item's location, content, and size.

    Freight truck & international items, will require up to 7 business days to ship due to size and logistics.

    All orders made after 3:00pm ET will be shipped or processed the next business day.

    Unless otherwise noted as "In Stock" or exact ETA. Special Order items have an ETA of 5+ weeks.

    Orders over $500 will ship insured and over $1,000 with signature and insurance in order to guarantee delivery. Orders over $1000 may not be able to ship to a different address not listed as the billing address or confirm payment address from the form of payment used. Orders with suite numbers, different billing, or apartment numbers will require signature if valued over $100.

    All international orders outside of the USA are subject to duties and taxes fees per your countries jurisdiction and determined by customs.
    Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.

    Processing and logistics on in stock international orders can take up to 7 business days to process & ship.

    In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
    Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail. All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).

    Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.

    For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.

    WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

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