APR Iridium Pro Spark Plugs - 14x26.5x16mm - Heat Range 9

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Part # Z1003100 Be the first to write a review

APR Iridium Pro Spark Plugs - 14x26.5x16mm - Heat Range 9

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MSRP $34.11
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APR Iridium Pro Spark Plugs are the excellent upgrade for tuned engines. Our spark plugs are made from Iridium, which is one of the strongest materials you can use in this type of application. They run cooler, resist preignition, last longer than other materials with higher melting points, and even require less voltage to produce a strong spark. The electrode is harder and stronger than other materials, can dissipate heat more easily, is better protected from melting, cracking, and other limitations found with standard plugs. These plugs were designed for use on tuned and higher output vehicles that benefit from a plug cooler than the factory heat range. They are great for high boost, high cylinder pressure, high cylinder temperatures, and high power situations, and they pair nicely with a set of APR ignition coils, where applicable.


  • Heat range 9 spark plug (Similar: Bosch 3, Brisk 10, Denso 27, and NGK 9)
  • 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum.
  • Stronger than copper and platinum
  • Designed for high performance / tuned vehicle applications
  • Non-projected insulator design
  • Lower required supplied voltage
  • Cooler operating temperature than stock plugs
  • Optimized electrode design for hard to ignite fuels, such as ethanol
  • Resists preignition better than stock plugs
  • Perfect for upgraded APR vehicles
  • An excellent match for APR ignition coils
  • Thread reach: 26.5mm
  • Thread diameter: 14mm
  • Hexagon: 16mm
  • Seat Type: Gasket
  • Install Torque: 25 Nm
  • Made in the EU
Brand APR
Emission Code6
Product TypeSpark Plug
Sale CategoryIgnition
Part NumberZ1003100
Always check sizes, gap, and heat range specs before installing. Installation of the wrong length plug can cause damage to the engine. You must verify this before installing the plug.

Have a question about this product?

  • Question

    Is it ok to use this part WITHOUT a tuned engine that is using the APR coil packs only? or do i need to buy original stock plugs?

    By Ryan FLoyd on March 26, 2023

    They were designed for tuned cars, but should work on stock.
  • Question

    What do you recommend for spacing gap size? I typically gap mine to 0.026”

    By Matt Berman on February 2, 2023

    Usually they are gapped just below that from the factory ~.02". Roll with the factory gap (assuming the same across all 4) and adjust as needed.
  • Question

    Is Quantity order 1 for a set of 4 or do I need to select quantity or 4?

    By Bradley Yates on May 13, 2023

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