Big Question ::: Are they worth the cost? "A" is a loud "YES YOU"! Not only is it great that most plugs don't need to be mated these days (I check the gap to make sure anyway). But for a little more money you get an integral part of the overall combustion process that contributes quite a bit to engine performance and fuel pump economy. With these spark plugs, the car runs smoother and has better throttle response. That says a lot now and now I have nothing more to say so as not to ruin a good review :-)
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