As far as those aftermarket bars, it also depends on your strut-spring/ coil-over set up. The rear (anti)sway bar will stiffen up the side-to-side of the ass end and give you a bit of oversteer. If you put an overly stiff bar on a soft damper and spring you will get too much oversteer. Also, if you have adjustable dampining coil-overs you might want to look for an adjustable sway bar- i know they have them for tegs.