Thom,
I have a '84 911 (sans A/C and other un-necessary creature comforts) so my car and your '81 SC should weigh about the same.
I installed Sanders 22mm (frt) and 28mm (rear) torsion bars a couple of years ago. My car is used primarily on the street, but also sees 6-8 DE days each year. This setup is coupled with Bilstein sport shocks and the OEM sway bars.
The above setup is great on the street because it provides a firm ride with very little body roll. I have ridden in a '83 SC that had 22/30mm t-bars; that setup was a little to harsh and choppy on the street.
Installation is a "snap" for the front t-bars. The rears involve a little more work and knowing how to equate swing plate angles to ride height.
After installing the larger t-bars and the Bilsteins, I had the car corner balanced and aligned.
Hope this helps. Bruce
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