I will be sticking to stock.

Those look essentially like a multi-ground plug to me... read about them here:

http://www.sparkplugs.com/sparkplug411.asp?kw=Multi-ground&mfid=0

Key words in that article being
Quote:
"Therefore a multi-ground plug will not perform any better and may actually perform worse than a traditional plug, unless the engine is designed for a multiple ground plug."
smile