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Title: Total Gimmick!
Review: Do yourself a favor and stay away from these plugs. I used them for a few months in my 02' Camaro when suddenly I noticed some sputtering and heavy hesitation, especially when the engine was cold. I checked the plugs and sure enough, two of them had severe gap erosion. I never even noted any gas mileage improvement. Not to mention these plugs are MADE IN CHINA! There is no substitute for good old fashion conventional design plugs. They've been in use for over 70 years after all.
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