lower sway bars, which the legend has stock, connects the sub-frame and acts as a twist-beam member to reduce flex and body roll.
a lower tie rod connects the two lower shock mounts together. act as a load distributor and helps keep the suspension flat in corners.
upper strut bars usually mount to both the shock tower and the shock mounting bolts, which ties together the sub-frame and suspension. they act as both twist-beams for the sub-frame and as a load-distributor to trasmit cornering load from the lean side to the roll side and help keep the car flat in cornering.
to maximize suspension capability you would want lower tie rod, lower sway bar, and upper strut bar.