You sir, are making a BIG mistake.
First of all, adding a swaybar will greatly change the handling of your car, most likely making it dangerous in accident avoidence maneuvering. Adding a sway bar to the rear will make the front tires "stick" to the road better while turning, and at the same time make the rear tires "unstick" from the road when turning. Front and rear sway bars have to be "matched" to avoid "understear" or "overstear". Without being able to drive the car on a race track (or some other "safe" place) and either having a whole bunch of bars (front AND rear) to try, or installing adjustable bars, it's a shot in the dark. I crew chief for an amature (SCCA) race team, and in the last two years we've spent four whole test days at tracks testing nothing but bar setups.