My 945T has Kings Springs and B4 Bilsteins which I bought from Ovlover some time ago.
The sways bars on it are standard - 1359808 (21mm) front and 16mm rear.
It feels far nicer handling-wise than my 945 NA which has original everything on it. The turbo handles better without compromising the ride comfort very much at all - yes, it's a firmer ride, but not unbearably so. Oddly enough, the NA wagon also has the same sway bat setup from the factory as the turbo wagon, yet the NA feels a lot sloppier in corners.
Of course the 945T is a long way from being a track car, and it must deal with the pot-holed goat tracks which are aka Australian highways, so it isn't lowered substantially (which in Sevens and Nines leads to geometry headaches without more bits), nor does it have poly bushes, re-valved B6s, adjustable spring platforms, the alloy control arms at the front, etc. However its spring and shock setup totally transformed the vehicle from being so-so to rather pleasant to drive on the street, especially long distance.