After scouring the interwebs about fancy spark plugs, why would iridiums make a difference? A colder iridium? Maybe. Same heat-range iridium? Makes no sense (to me).
Hell if anyone can explain that, I'm all ears.
I'm not one to waste money on fancy gimmicky spark plugs. I never bought split fires, E3's, triple platinum nitrogen coated etc...
These plugs are used in the new dual vvt-i 4.0's found in the 4runners and FJ cruisers.
I had these laying around when it was time to change the plugs in my truck because I was going to put them in our FJ. I checked around to make sure they would work, which they do, then I installed them.
Ever since then, I haven't had a single ping.
I have had several supercharged and nitrous fed vehicles and have had my share of pinging issues. As others have stated, pinging is usually caused by timing or octane issues.
It just so happens that these plugs cured my pinging. For $50 and an hour of your time, I highly recommend it.