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Do the tuners that have pots that basically just richen up the amount of fuel help much in the way of performance?
As suggested above, not so much.
While you will read lots of anecdotal evidence, the fact is most EFI systems contain a couple hundred cells and many other tables all trying to work together to meet the needs of the end user.
There might be a cell of two that will benefit from a specific increase in fuel...but the cells on each side of it may require less fuel. To simply dump in more fuel across the board usually doesn't work so well.
Do yourself a real big favor and spend some time understanding the HD EFI system. You'll most likely make a more informed decision and start seeing just how much BS there is on the entire subject.
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