Originally Posted by psr

I will reply on the G- power later since I have no knowledge on it....Iridium is purely for making the plug last longer ,with better temperature tolerance,and by making the electrode thinner the iridium will spark even with low output of HT.
The side gapping actually allows the flame kernel to develop into the cylider much quicker than normal spark plugs.
Any side gapped plug whether it is copper shrouded nickel, or Iridium will have this advantage.
Do not opt for platinum plugs as they are notorious for fouling in real life use. They are for a much higher temperature usage.