It is a matter of degrees. The 2013/14 ST/RS/RSS models REALLY need a lot of Sway Bar help. So you will see a great deal of improvement there.
The 2008-2012 RS/RSS models need sway bar help too, but not as much. The difference is still significant, but not as dramatic as for other models that needed more help to start with.
The real eye opener is when you get accustomed to riding the improved sway bar and then ride a stock Spyder. That will get your attention! :yikes:
Have Fun This Summer!

hyea: