Scion TC 08: Advantages vs disadvantages to adding strut and sway bar.?

Update: Is a rear strut bar and a rear sway bar were the same thing? If not, what's the difference? Also, if I were to pick one, would you get the front or rear, or would that not make sense? Also, what's the difference in "stiffness settings"? Big difference or no? I drive fast and hard but I'm not a... show more Is a rear strut bar and a rear sway bar were the same thing? If not, what's the difference? Also, if I were to pick one, would you get the front or rear, or would that not make sense? Also, what's the difference in "stiffness settings"? Big difference or no? I drive fast and hard but I'm not a racer.
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