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Well, Eddy has it right here, I tried a run with the vac hose attached and the butterflies working, then the same run with the vac hose removed and the end plugged. Not a huge difference on the flat when gradually accelerating but you can definitely feel it coming off idle. Going up a hill, its very noticeable coming off the start and clear up to 55 or so. I'm not talking about lead footing it, talking about just a normal startup and ease in to traffic kind of thing.

Seer
i saw no loss in low end power i have 2 trucks with and 2 without the butterflys

it dosent have to be surrounded by water to be an island