BTW just so we're all talking about the same thing:
a sway (or anti-sway) bar is a torsion bar (ie a spring in linear form) that mechanically connects one side of the suspension to the other side. It is installed from the underside of the car. It acts to transfer spring force from the unloaded inside wheel to the loaded outside wheel when cornering, so that the end result is greater cornering power. The stiffer the sway bar, the more the independent suspension behaves like a solid axle (ie ride degradation).
a strut brace (or bar) is a rigid brace that mechanically connects the upper parts of the suspension together, and in some cases also to the car unibody or chassis. It is installed under the hood (or in some cases, in the trunk or luggage compartment). It acts to structurally stiffen the suspension attachment points, so the end result is reduced chassis flex.
Adding the TRD rear sway bar (or in the case of Hotchkis, also replacing the front sway bar) will yield an immediate benefit when cornering but slightly degrade the ride. Adding a front strut brace will only yield results when cornering hard and does not degrade the ride at all.
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