Now, that is interesting. I had a set of E3 plugs in my C5Z but when I had the STS turbos installed, that were taken out and replaced by a more standard plug, but a step colder. I've been thinking of going back to them, but I guess I need to check with Chris to see what he thinks about them in my new motor.
The research I did about them before getting a set showed good reviews, where I could find them.
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