HKS Super Fire Racing Iridium Spark Plug (Heat Range 7) | 11-16 Honda CR-Z

Regular price $23.97 USD $23.97 USD Sale

Ready To Ship! Special Order! Ships in 10+ weeks

Part # hks50003-M35i

HKS Super Fire Racing spark plugs are manufactured from NGK using their top tier "Iridium + Platinum Double Performance" to provide reliable ignition performance that produces faster and more efficient combustion. This also provides accurate ignition that ensures reliable engine performance for a long time and in various environments. 

This is recommended for drivers who track their vehicle often (naturally aspirated) or for those who daily drive a forced induction setup under 250 whp. If you are running higher power or track a forced induction setup then you might want to go one step colder.


Tested Applications:

  • Honda CR-Z [ZF1/ZF2] (2011, 2012, 2013, 2014, 2015, 2016) 1 step colder


  • 0.6mm Iridium Alloy Center Electrode: reduces voltage requirement and improves ignition performance and durability
  • Outer Electrode with Platinum Chip: improves durability thanks to a shortened tip design and tapered shape 
  • Short Type Outer Electrode (Anti-Vibration): engineered with the ideal shape to decrease weight for resistance against vibrations which in term improves longevity of the outer electrode.
  • Thermal Edge: helps decrease carbon deposits that occur after long idling or under various combustion conditions
  • Spark Support Gap: Discharge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup


  • Type: Spark Plug
  • Plug Type: ISO
  • Manufacturer: NGK
  • Technology: Iridium + Double Platinum
  • Thread Size: 14mm Diameter - 19mm Length
  • Wrench Size: 16mm
  • Heat Range: NGK 7

Customer Reviews

Customer Reviews

Based on 1 review
Joseph F. (Jacksonville, FL, US)

These got installed with my HKS supercharger, had no issues and these are definitely high quality.

Customer Questions


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