I finally gussetted my rear shock towers and went to full coil-over / 935 spring plates in the rear of my 1987 Carrera. If you have a G50 car I have for sale :
A pair of Sway-Away solid 30 MM rear torsion bars
A pair of sway-a-away adjustable spring plates (a HUGE help in fine-tuning corner weights)
I would match the 30 rears to 22 mm front torsion bars for optimal balance.
I would have Clint at Rebel Racing custom valve your shocks to match the spring rates of the bars, properly corner weight the car to 50.0% cross weights and you won't believe it's the same car. It will be much easier to balance and manipulate (rotate) at the limit.
Torsion bar 911s are very softly sprung (esp compared to my stock E30M3 which has a very stiff race suspension, and even at these rates, the 911 is still softer). The 22/30 takes you to about 273/308 lbs at the wheel (here's my source
911CoilConv)
Here's my ad for the components, iif you're interested, just PM me. I sold the fronts a couple years back, had to go to 24mm front because of my GT Racing splitter's downforce to keep the front from bottoming out at speed.
I'm currently asking $450 for the spring plates and the 30 mm solid bars as a set.
http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/886991-fs-adj-spring-plates-g50-30mm-solid-sway-away-torsion-bars.html