The difference is night and day, but they are kind of overkill on a street only car. Dont get me wrong they make the car handle better in some conditions, but everyday road manners will deteriorate noticably, depending on how rough the roads are in your area you might hate them. Your car wont soak up the real big bumps anymore, you will. (Although you probably wouldnt notice this at first because you would be ripping your car around the corners enjoying the perceived improvement because there is less body lean, and improved turn in) I live in O.C. and we have a mix of great roads and horrible roads, the thicker bars feels great on the smooth roads, but more often then not, the roads are not super smooth. The car rides better, turns more evenly, and produces higher mph's in turns with the stockers. The thicker bars can make the ride a little twitchy. And will likely create a understeer or oversteer contidion at low or high speeds depending on the setup.
Keep the stock swaybars. Ford went through alot of work to create some balance with the chassis., Some random swaybar kit will not not help I'm sure Eibach et al didnt spend millions like Ford in R&D and the results speak for themself. I have been in Suspension Parts Denial before(many time tinny) that is why I can type this.
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