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The '08 Impreza rear trailing arms' bushings resist braking and engine torque loads, but have enough compliance to allow the toe link to steer the tire inward under roll. You can also see the position of the upper control arm. To clear the frame rail and the coilover shock absorber, the upper arm had to be cast from steel. Although it's an expensive process and results in a heavy part, it would have been difficult designing a stamping to snake through this limited space. Note the bosses for a disc brake caliper in this drum-equipped car. You can also see the mounting boss for a rear anti-roll bar.
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