I'm also a bit worried they may create a flame that will burn a piston. The design of of a plug creates a consistent burn. A "better" spark may ignite the fuel too quickly and while it may appear to give a power increase, it's detrimental to the life of the engine.
I'm kind of thinking this through as I post trying to come up with a good answer as to why it appears to give a power increase, and why that isn't necessarily a good thing.
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