I dont understand something. Isnt a 'spark' just a spark? I mean a spark out of an iridium plug, copper plug or platinum plug should be the same. The spark will ignite fuel and air mixture and thats it. You cant ignite things any better. Once the burn has started then you will make power.

From what I understand, only the heat range is the critical factor. Durability is nice too but I'm one to check my plugs from time to time so I dont care about plugs that last for 60K anyway.

Anyone care to shed some light on this? I mean does it matter what the plug is as long as the heat range is correct ??