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I read a post that used the company name Extrude Hone out of Irwin Pa. I checked out their web sight and they show some pricing for doing V8 exhaust manifolds for $675.
http://www.gethoned.com/parts.php?get_price=yourparts&show=automotive

Has anyone tried this? If so, do they give a flow rating? Does anyone have any real-world experience that they can share? I hear that they are only worth minimal, but I am looking for actual numbers if anyone can help.
I have read other posts about this process, but I am looking to see if anyone has any dyno or time slip results to compare.

Thanks

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Waste of money