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spark advance

  1. superchip?

    Performance Mods - Engine - 5.9 Liter V8
    Ok guys. I have a superchip 3815 I believe it is. Well today playing around on it. I noticed it has spark advance feature on it. What is it? And is it anything I should mess with? Would it give me more performance or better fuel mileage? Thanks for ur help
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