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I'm not familiar with the products on that site but I would assume that the RCA's should worsen bump steer if anything (because now the steering arms and suspension arms are no longer parrallel). Make sure you get both the RCA and the flip kit thing as having only one is probably not a good idea.
On a side note, the purpose of RCA's usually isn't to eliminate bump steer but rather to change the suspension geometry in a way that increases the resistance to roll (raise roll center).
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