Quote:

Thought this was April fools till i realised it's a few weeks away.

Plug INITIATES the burn , that's all it does , too cold a plug for the application 'may' leave a 'tad' power on the table due to unburnt fuel residing in base of plug , then you have too hot a plug 'may' leave a 'tad' power on the table due to mixure being lit off 'slightly' earlier , pretty 'negligible' which ever way you look at it.



Ok... weather I believe or not, how do you explain
the difference in HP on the dyno and the better idle
quality if they are a straight change heat range wise
and I do understand the principles of the plug