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Anything but +4's those things cause more problems than they're worth. Plugs are plugs. Stick with a no gimmick motorcraft part and you'll come out on top. The plats really just last longer. Oh, and the stock plug wires on the zetec are pretty well insulated...just to let you all know. I saw one get dyno'd and they asked what kind they were because they were having trouble getting through them.
 

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This sucks, i just had bosch +4's put on my zx3 today, at idle it sounded rougher, and felt and little rougher, but only at idle.
 

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Should i stick with the stock plugs?
 
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