The factory ones are not adjustable so if you lower your car too much it might throw off your camber. To get your car aligned correctly, you may need these. Same with the toe, which will cause more wear on the tires than the camber if not aligned.
Nice video! I don't need these just yet as the tire shop was able to get me within factory specs after my coilover install, but this will be a nice reference for when I eventually do upgrade to adjustable arms.
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