QSD,
For the record....
I had nothing to do with Champion's iridium plug that you say is suposedly for the 2.4L PT engine. I voiced loud concerns with the Denso screwball setup a few years ago.
I did get the double platinum plugs #7440 & #7570 to market, way back in late 2000 & early 2001. They are mine, but the iridiums are not.
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