Iridium Spark Plugs for 7MGTE / 1GGTE

Iridium Spark plugs are a new generation of plug designed to replace the more regular platinum plugs used as standard on most Japanese engines.  Iridium is claimed to be 6 times harder and 8 times stronger than platinum, allowing for a finer electrode which lasts longer and requires less voltage therefore producing a hotter spark.  For extreme turbo applications the hotter spark and colder plug combination are very desirable attributes.

Replacement guide:

Manufacturer Stock Platinum Replacement Iridium
Nippon Denso (available from Toyota) NQ20 IQ20


Note: NGK Iridiums require a small amount of re-gapping to suit the 7M/1G.  Given the electrode on these plugs is extremely fine, be sure to take a lot of care not to damage it when gapping.