The stock bushings have notches that go into the flats on the sway bar. They keep the sway bar from "walking" or sliding side to side... and it makes the bar feel spring loaded
If you upgrade to poly sway bar bushings you'll need to clamp the sway bar, either with heater hose and hose clamps or with clamping collars if you want to get fancy. Otherwise the sway bar will side to one side on the bushings, the poly bushings don't have the notches like the stock ones. I upgraded to the Prothane sway bushings and it corners a lot flatter without any change to the ride quality.
EAP with 1/3 of the cold weather package. No block heater or TCS.