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At the rear, the manner in which the TRD units are installed will affect the smoothness of the install and the performance of the coil-overs. The rear dampers have two additional 12mm mounting bolts located at the mid-point of the shock body. Again, the sway bar is removed for better access. When installing the rear coil-overs, Mullinax told us that the key was to tighten the lower bolt first, the three upper bolts second and the middle bolts third. Not following this order can result in a gap at the top of the coil-over and an accompanying rattle.