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To me the correct answer is: if you're going all out on your suspension and you want it to handle as best as it can with proper geometry - get all 3 arms.
If you just want to lower it and get it to proper stationary alignment specs you can get away with just the RUCA's and toe rods. My current car, and previous S13/14's that I've owned with just RUCA's and toe rods all drove straight and didn't eat tires.
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