S model= no rear sway bar for cost reasons. Steeda makes a rear sway bar for cars that didn't come w/ them. The kit comes w/ the brackets that work for none rear sway cars. Try that 1st. Like geezer said= dampers/tires make the difference compared to stress bars.
Interduce Mr. Torsen to the mix
D23 crew- D-Tech- Sedan Revolution= #131