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For the ecotec engines I don't think you'll find a better plug than the ACDelco dual iridium. 150,000 Kms on my 07 and still waiting to see a misfire.
 

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I did AC Delco iridium plugs
 

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Seems with most GM products that AC Delco are the way to go.
 

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Seems with most GM products that AC Delco are the way to go.
I always try to run Delco products when I can.

I have NGK Iridiums, but that's because I had to go a stage colder. Given the recent minor spark knock I saw on the dyno, it's entirely possible I should have gone a second stage colder.
 
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