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Looked on Amazon and they are about the same price as the NGK plugs so what they heck try them.E3 plugs have been proven to add horsepower and economy. But your talking in the gains of 1 to 5% which on a big V8 that would be a number worth the money on our bike. Well it doesnt make it look better. We already get 38 to 40 mpg and its only going to add maybe 1 to 2 hp. So not worth the money to me. not sure what the price difference is between those and some good NGK's. But that is just my opinion.
Let us know how it works out. I already have the NGK plugs for mine so I'll just use those this round.