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you WON'T need one with the Swift springs...they are only rated at 0.6" front and 0.7" rear drop. They keep you within spec...and they don't suffer from the typical sagging over time that manyother springs do...
I wouldn't say he wont, it seems that there are a few that do need them after a drop. While most of the drops under .8-1" it you can stay within spec there are people out there with springs under .8-1" that had to get camber kits, or live with it being out of stock specs. They are the minority though.