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I remember the butterfly valve as pretty darn flat, and definitely not having big screws hanging down. If you are considering the parting and polishing that that person did, it looked pretty labor intensive and looked to have involved many different fine tuning adjustments. All of which coupled together may have led to a modest noticeable performance increase. So swapping out the butterfly valve -I don't think so (though not an expert) But filing the edges looked cool (if it didn't change the shape and made it leaky) and all that polishing sure looked great, which is most of what he was after.
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'97 855na, Mobil 1, K&N, various IPD's and eBay's
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