It depends. Usually, for street driven cars with most of the drivers who show up on here, the answer is no - you just add the camber compensator, set it up for the amount of pre-load you feel good with (which directly affects the rear ride height) and drive it.
I've noticed that most of the people on here adding camber compensators don't do much with pre-load; they just install it as-is and go with that. We used to have adjusters below the tranny and others at the wheel ends to adjust each side separately up and down to set the cornering pre-load we wanted so we could "dial it in". Seldom saw that attention to detail on a street (non-track) car.
If, on the other hand, you want to track race it a little and need that extra cornering ability to be competitive, then you start looking at the combination of torsion bar and camber compensator and shock dampening rates to get the right amount of resistance to the rear suspension travel to match your driving (or the track, or both). What you're trying to do is manage the amount that the body rises off the wheel when cornering, because as it rises, the wheel begins to tuck under, loses grip as it rides up on the sidewall and/or breaks the tire bead (in extreme cases). Most street driving can be managed by "over stiffening" the rear spring rates by simply adding the camber compensator as an additional spring. The ride will be stiffer overall, but the amount of cornering roll will decrease (the car will corner flatter). Also, most people on here aren't that aggressive driving on the street and don't need to go all out with suspension mods. Simple stuff will suffice. BTW: Porsche had a number of torsion bar thicknesses offered (mostly for racers) to allow tuning of rear suspension feel.
So.....long winded answer summed up: 3/8" - 3/4" (15mm - 19mm) Anti-Sway bar up front, decent camber compensator in back (installed stock) and that should do it. If you want more cornering "oomph", just add a pair of Bilstein shocks. Be forewarned - your ride will be stiffer than no bar/compensator.
There was a good article written a while back by an Australian VW Sedan racer which outlined how to make your swing arm suspension really handle. If I can find it, I'll post a link.
I couldn't find the link I wanted, but the Shop Talk Forum is always a good place to OD on information. Try here: