Quote:
Originally Posted by thejeremyman9
Cons of colder plugs/smaller gap: Potential for rough idle/cold starts, more prone to fouling, especially if you frequently take short trips with many cold starts.
Pros: Potential to eliminate misfires / "spark blowout" at very high boost levels with smaller gap, but again, 99% of people don't need this.
Pros of stock plugs stock gap: You want the biggest gap possible (without issues) so you start here. That gives you the best combustion.
Cons: None, unless you start getting misfires.
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From what I read at the forums, bigger gap is better for idle, smaller gap is better for boost. IE ProTuning Freaks(BM3) recommenced NGK 2 step colder plugs 0.21-.0.23 for tuned cars running boost. Log your car at WOT and see if you have any pulled timing or engine knock. I'm personally running NGK 2 step colder at .024 gap. See what your car likes.