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I was browsing through here a few weeks back and came across an article.
It was an F-350 dually 4x4 with a efi 460 in it. The testing they were doing was finding out which products worked best (cold are intakes, exhaust, fuel pumps, various things).
Now for the life of me, since I forgot to save the page, I cant find it anywhere. If anyone knows what I'm talking about I would greatly appreciate the link to that page.