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Originally Posted by chimmike
it opens at that rpm to allow the air to enter shorter runners. Shorter runners=better top end. Longer runners=better low end. Opening the butterflies early can actually lose power, as has been proven before.
I wouldn't mess with the butterflies unless you're turbo.
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with the exception of loctiting them.
Mike is right though, people have removed the butterflies alltogther/left them opened however the little bit of top end gained doesn't offset the lower end power you lose.