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more than the type of plugs i would look for one that have the correct temperature range. i've taken out my plugs last week and from what i could see they were overly too hot for the car.
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You got colder plugs for a _stock_ engine?.... erm.. You dont need colder plugs unless you go forced induction and even then its a test first and then choose. Looking at the plugs wont tell you if they are too hot.
Too hot = detonation, Too cold = fouled plugs... and its not an easy thing to determine.
Easiest way to go about it is, to get few ranges colder than stock, then if they get fouled, get one hotter, again chekcing, till they dont get fouled. That would be a working plug temp-range for your specific engine. Then again, for stock or with bolt ons, the stock plug is really the correct choice.