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you're going to need to scale your maf when you install an intake regardless of whether it explicitly altered the diameter or not. hell, you should probably scale your maf even if you haven't change anything.
but it would be of little benefit for them to provide base numbers, as it's so simple to do and you'd end up fine tuning it regardless even if they do provide them. you could just as easily do the math yourself and start from there, or just start with the stock scaling and tune the thing. there will not be a case in which you just plug in numbers from a vendor and your maf is perfect.
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