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From what I've heard others that have tried these types of plugs they are no better than regular plugs. I use platinum's (usually Bosch) and have had several sets to last over 100,000 miles without any drop in FE. There have been times that I changed them just because they had so many miles on them, but were still firing fine. The reason I use platinum's instead of regular copper core plugs is because of the long change interval. Be sure to use anti seize on the threads whatever type you decide on. I stripped the threads out of a spark plug hole one time because it seized in the aluminum. As for wires I have the best Auto Zone brand wires on my '88 Escort and still have the factory wires on the '97. The Auto Zone wires also have a lifetime waranty if you buy their best grade.
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