I thought about doing that but decided i like the way it handles with stiffer springs and less bar.
But for inspiration, here is a corolla with hollow adjustable cobbling action.
How's it handle (loaded question)?
less roll will always make a car feel more confidence-inspiring. Same with more damping.
Too much rear bar on soft springs will lift the inside tire on exit, something volvos gleefully exhibit. Same with too much damping.
Getting that inside rear to stay down was a challenge
here's where I messed with more rear springs (includes tender spring) to get more supported droop travel. I also softened the rear spring rate from, I believe, 325lb to 250lb (main) at the same time. It did help with rear grip(traction)
http://forums.turbobricks.com/showthread.php?p=3296622#post3296622
No rear bar on my car at this time. I pretty much dumped the rear bar when I stopped autocrossing on street tires and got enough camber on the front (at least -2) to get it to turn in. On ~0.8 deg. negative camber with stock-diameter front springs, and street tires, I had a big rear bar and the car was loose, but turned, and was fast when I got it right (fast relative to itself, but I sometimes beat faster cars with slower drivers)
The final iteration never got close to sorted out. Probably needed to look at roll centers or something to try and keep the car on the ground
(this was slightly off camber, so helping the car lift off a bit more than just flat steady state cornering)
Watch an autocross vid of a stock class BMW. The ones with a big front bar and konis cranked full counter-clockwise lift the front tires in an odd way. But they are almost always open diff cars, and they need the traction on turn exits. And early rules only allowed changing the front bar.
Looks like this:
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One comment I still remember from mikeP was about using a big rear bar with a welded diff, to get it to turn. With a locked diff, you're not worried as much about hiking the inside tire because you'll still have drive off the corner. But if you get to the point of overpowering your tire(s), then you'll need to reconsider.
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Drive it first and see what it needs. I made changes based on results & testing, having taken a baseline from other proven setups. Anthony Hyde's page if it's still around had a lot of good info on it about 240 suspension.