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13:1 isn't so bad, and it's only there for about 1000rpm.. a little leaner than most like to go on turbo, but not crazy. What's important is that it's at 12:1 at the higher rpms where detonation is more prone
What ID piping did you use for the MAF?
What is your base timing?
Have you done a compression test? if so what kind of numbers?
good numbers!
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