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The Fsport rear sway bar is 19mm and the stock is 16mm. That 3mm difference makes one hell of a difference! It doesn't do anything in regards to ride quality...still the same stock dampening, because you haven't really messed with the springs or anything, just that there is a lot less sway with the F sport bar and it feels much more tighter and easer to control on tight turns.
I agree I have the rear sway bar and it does make a difference in a positive way. I can rip around turns faster then when it was stock. Also less body roll. I don't feel any oversteer on back roads.

The stock ISF rear sway is 17mm. I measured it when I changed mine to the F-Sport Bar. I agree the 19mm F-Sport is an improvement, with a little harder ride. The only reason I mentioned the size, is because I didn't want to perpetuate the wrong size being quoted. The 16mm myth really screwed me up when I was changing bars and trying to sell my old bar. It took awhile, but I did confirm the 17mm size with Lexus corporate.

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