there are better tuned timing/fuel maps with the S1.
EDIT: sorry, didnt realize that I didnt answer your question[B)]
just going with S1 will not only up your power, but do it safely with the correct fuel. Just blindly cranking up a boost controller is like throwing matches at a gasoline can...one day it will blow. Before turning up boost, you need to see a/f ratios and at least know what levels you are currently at. Turbos and fuel systems have limits and going past them can lead to some pretty bad stuff.
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