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I actually tried the NGK colder plugs but my car didn't seem to like them as much on Stage 1+ E50 v9. I had a "jittery" idle. I went back to the stock Bosch plugs and car has rock solid idle at this point and no misfires or even timing corrections to speak of.
I am also using the Eldor coils if that makes a difference.
From what I have read it seems like you don't really "need" the colder plugs when you have upgraded turbos or single pushing significantly more boost.
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