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spark plugs are pretty much just a dumb end of a wire sparkmaker thing, one's about as good as another. all these iridium, neodynium high pluton quattrio electrodic capacitor emittitron stoggnitonic altruisticon element sorta plugs are pure marketing bravado. you might get 1/4 more hp. at 8,000 rpm with some fancy plugs. that said, it's more about the energy going to the plug than the plug itself.



Those experienced in tuning forced induction motors will disagree with your opinion.

IMO, in our twins, spark plugs are not going to make power, however under some circumstances sub-optimal plugs can lose power.

IMO, the most effective combo in our bikes are PVL coils (branded as "Nology" in NA), TPUSA Magnecor "red" wires, & NGK IX plugs.

The above said, the OEM stuff performs just fine.