This is something I have been pondering for a long time. Do the more expensive spark plugs really work better? I have had terrible results with my S-10 when using Splitfire, Platinum core, Bosch +4, and all the other hyped plugs. When I go back to my cheap Autolites or AC Delco, my truck would run fine. Used Bosch +4 plugs in my Saturn and noticed no difference. Does it sepend on what kind of car you have, or your set-up under the hood?
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If I'm not mistaken this is the plug that is currently installed in the Vibes from the factory.What I have found out over the years is some plusg have less resistance to current than other plugs and there for produce a slightly stronger spark. You have to find what you personally like to use and what you feel works best in your opinion. I personally love Splitfire triple platnium spark plugs. Other hate them.