tie bars=waste
If the car needed them,it would have had them. But,if you MUST have them,your supposed to drill into a few parts down there to mount them,think where the sway bar mounts up? not exactly sure,just i have been told its the one thing that will provide the LEAST amount of performance.
Best order to do things:
Struts
camber kit
Lowering springs or coilovers
strut tower bars
then MAYBE tie bars,if you dont have anything else to waste your money on

Anyways,there is a kit that gets sold that includes all 4,front an rear strut tower bar,and front and rear tie bars,made by megan racing,those tie bars would probalbly
be best...