Mod for smooth ride?

[Loren]

Yeah. You need to properly describe the problem to get the correct answer. If the ride is rough (which... compared to something like a big Lexus, it is), there really isn't much you can do about it besides fit tires that have softer sidewalls to absorb more road imperfections and make the ride smoother.

If you're feeling too much body sway, like from cross-winds and such, then the rear swaybar will definitely help. But, that's not adding "smoothness", that's adding "stability".

Upgrading to more performance-oriented 15" tires (or even better 14" tires to a lesser degree) will also help with stability.

You might try raising your tire pressures a bit. 35-38 is about right, but some people run 40-45. That will improve steering response and eliminate most of the "give" in the tire. Will definitely make the ride LESS smooth (the tires will transmit every little bump in the road), but somewhat more stable.