ACDelco 41-110 Professional Iridium Spark Plug (6 Pack)

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I tried another brand because of all the clever marketing schemes, but my 2012 Corvette engine just didn’t seem to run correctly after the change. I have owned this car for 10+ years, and have since become familiar with all the characteristic and sounds during smooth operation. I decided to switch back to AC Delco which was original equipment, and my car now runs flawlessly. There is a reason why GM engineers went with this plug in the first place, because it is the best match for the Corvette LS3 engine.