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They've got the coilovers for the front. For the rear, you would use the adjustable perches. The reason that you don't run coilovers in the rear is because that moves the weight bearing point to the shock tower, which wasn't designed with enough strength for that.
I'm not saying that it is impossible to run coilovers in the rear, just that it would take a lot of reinforcement, which translates into a lot of work.
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