My friend Ted.... you have no idea the SIZE of the can of worms this question opens
Some argue you can never go to BIG with "anti-roll bars" and others argue that it (roll) is all controlled by the torsion bars and anti-roll bars only adjust the last 5-10% of roll.
My $0.02 is that for a full track car (e.g. #60 2.0L SSPI car) we run a 31mm front Charlie bar and a rear 19mm rear OEM bar with revalved Bilsteins and they (the bars) aren't stiff enough. Some of our competitors have turned to NASCAR size bars and machine the ends to fit the rest of the Porsche parts (drop links, Aurora eye bolts, etc...). Allows you to go bigger than 31mm in front. Mind you, none of these cars could ever be comfortably driven on the street.
I think you'll land somewhere above the stock 20mm (front) and 18mm (rear), closer to 22 or 23mm adjustable front and something like 20 or 21mm adjustable rear. Remember, each mm in bar diameter increases torsional resistance exponentially (see BA's Performance Handbook). MOST importantly, match the anti-roll bar rate to the installed shocks /struts and weight of the car. (earliy cars = light, Carerra = heavier)
One of our sponsors offers these:
Charlie Bar (we have run for years and are excellent quality):
The Racers Group:
*(available in 19, 22, 25, 28mm)
I think these bars below might be the setup you are looking for and are currently being tested by other Dorki in our midst:
Smart Racing:
Hardware:
*(available in 20, 23, 27, 31mm).
Here is a
decent thread on Pelican as well.
Let me know when you start looking for an enclosed trailer and SUV / tow vehicle for a "once street driven '85 Euro Carrera" you used to be familiar with
Ahhh.... the slippery slope...
Jason