Regular price $23.97 USD Sale price $23.97 USD Regular price $23.97 USD
Special order - Ships in 5+ weeks
SKU: hks50003-M35G
Product Description

Unleash the true potential of your engine with HKS M-Series Super Fire Racing spark plugs. Engineered to excel in high-performance tuning scenarios, these premium Iridium plugs deliver enhanced ignition performance, exceptional durability, and effective anti-carbon build-up capabilities. Regarded as some of the finest spark plugs available, the M-Series offers a reliable ignition system, optimal durability, and effective prevention of carbon buildup even under heavy load conditions.

The choice of Iridium alloy for these plugs stems from its remarkable durability and reliability. While narrow core designs in typical plugs often lead to a reduced lifespan, the inherent strength of Iridium ensures longevity is not compromised. With an impressive melting point of 2454 degrees C, surpassing white gold's 1769 degrees C, the electrode demonstrates exceptional resilience against high levels of compression and minor knocking, avoiding any performance deterioration. Furthermore, a nickel coating on the housing safeguards against premature plug degradation.

HKS M-Series Super Fire Racing spark plugs are available for various applications, catering to a wide range of vehicles. They are offered in colder heat ranges of 7 and higher, and specifically for rotary engines, heat ranges of 9 and higher are provided. Elevate your engine's ignition system to new heights of performance and reliability with HKS's superior spark plugs.



  • Mazda 6 (2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012)
  • Mazda 3 (2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013)
  • Mazda MX-5 (2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014)
  • MAZDASPEED 3 (2007, 2008, 2009, 2010, 2011, 2012, 2013)
  • MAZDASPEED 6 (2006, 2007)


  • 0.6mm Iridium Alloy Center Electrode reduces voltage requirement as well as improves ignition performance and durability.
  • Outer Electrode with Platinum Chip The Outer Electrode incorporates a square platinum chip which improves durability, and when combined with the iridium center electrode boosts ignition performance.
  • Short Type Outer Electrode (Anti-Vibration) The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves the longevity of the outer electrode.
  • Thermal Edge After long idling or various combustion conditions carbon buildup can occur causing misfires. The Thermal Edge of the ceramic insulator will discharge to help decrease carbon deposits.
  • Spark Support Gap Discharges will occur in the Spark Support Gap (space between the tip of the insulator and the base of the outer electrode) to help prevent carbon buildup.

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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