Do I need adjustable rear lower control arms when lowering a 2022+ WRX?

Do not buy them preemptively. Lower the car, let it settle, get an alignment, and let the alignment sheet tell you whether you need them. Here is what is actually happening. Lowering a car pushes the suspension further into its travel, and the control arms swing through their arc, which adds negative camber - the wheels tilt inward at the top. It also shifts toe. Both are geometry, not a fault, and both happen regardless of whether you fitted $250 springs or $2,000 coilovers. The question is whether the resulting camber falls inside what the factory adjustment range can correct. On a mild drop it frequently does, and you need nothing beyond a normal alignment. On a significant drop it frequently does not, particularly at the rear, and that is when adjustable rear lower control arms earn their place. They let the alignment shop pull camber back toward specification instead of shrugging and handing you the sheet. Why it matters: excess negative camber wears the inner shoulder of the tire while the rest of the tread looks perfectly healthy. You can destroy a set of tires in a few thousand miles and not notice until you run your hand across the inside edge. Adjustable arms cost roughly $240 to $360 for a pair. A set of tires costs more. There is a second reason worth knowing. Some owners deliberately run more negative camber than factory for better cornering grip, and adjustable arms let you dial in a specific figure rather than accepting whatever geometry gave you. If you autocross or track the car, that control is genuinely useful. The practical sequence: fit the springs or coilovers, drive for a week or two so the suspension settles, then get aligned and ask the shop to show you the before-and-after numbers. If camber is out of specification and they cannot correct it, buy the arms and get realigned. If it came back inside specification, you have saved yourself the money. One related note: camber bolts are a cheaper partial solution that provide a smaller adjustment range. For a mild drop they can be enough. For a significant drop, adjustable arms give you the range and the precision, and they are the more durable answer.