APR Iridium Pro Spark Plugs - Heat Range 9


Manufacturer: APR

Ships In: 1-3 Business Days from our Facility

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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
Vehicle Application Data
Manufacturer APR
Shipping 1-3 Business Days from our Facility
Vehicle Application Data
Make Model Engine
Audi 8V RS3 (2017-2020) 2.5 Turbo - DAZA
Audi Audi A3 - 8V (2014-2021) 1.8 TFSI
Audi Audi A3 - 8V (2014-2021) 2.0 TFSI
Audi Audi B8.5 - A4 (2013-2016) 2.0T - Valve Lift
Audi Audi B9 - A5 (2018-Current) 2.0T
Audi Audi C7 (Facelift) - A6 (2016-2018) 2.0T
Audi Audi C7 - RS7 (2014-Current) 4.0T
Audi Audi C7 - S6 (2012-Current) 4.0T
Audi Audi C7 - S7 (2012-Current) 4.0T
Audi Audi D4 - S8 (2012-Current) 4.0T
Audi Audi MK2 TTRS (2009-2014) 2.5T
Audi Audi MK3 TT (2016-Current) 2.0T
Audi Audi MK3 TTS (2016-Current) 2.0T
Audi Audi S3 - 8V (2015-2021) 2.0T MQB
Audi B9 Q5 (2018-Current) 2.0T
Volkswagen Arteon (2019-Current) 2.0T MQB
Volkswagen Atlas (2018-Current) 2.0T MQB
Volkswagen B7 Passat (2012-2019) 1.8T TSI
Volkswagen Beetle (2012-2017) 2.0T Gen3
Volkswagen MK6.5 GLI Facelift (2016-2018) 2.0T EA888.3
Volkswagen MK6.5 Jetta Facelift (2015-2018) 1.8T Gen 3
Volkswagen MK7 GTI 2015-2017 2.0T MQB
Volkswagen MK7 Golf (2015-2021) 1.8T MQB
Volkswagen MK7 Golf Alltrack (2017-2021) 1.8T MQB
Volkswagen MK7 Golf R (2015-2017) 2.0T MQB
Volkswagen MK7 Golf Wagon (2015-2021) 1.8T MQB
Volkswagen MK7.5 GTI Facelift (2018-2021) 2.0T MQB
Volkswagen MK7.5 Golf R Facelift (2018-2021) 2.0T MQB
Volkswagen MK8 GTI (2022-Current) 2.0T MQBe
Volkswagen MK8 Golf R (2022-Current) 2.0T MQBe
Volkswagen Tiguan MQB (2018-Current) 2.0T EA888 Gen3.B
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