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by doing this work you would also be enlarging the intake, because you are removing metal from the intake until you get to the "even" part of it.
I've also read that the air intake is intentionally left with the rough texture, both to help with air flow like was already stated, and to help with fuel mixing, that it wouldn't have been that costly to do this kind of work at the factory when you have 10,000 intake manifolds that are being built, if it really did help, and that an easy way to do that would be to build a welded intake, instead of a cast intake.
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