I figured the bar would lock the rear wheels up, from the pic above it looks like you would have to remove the rear steering pin to install the bar. I belive it was stated somewhere that hicas adds 20 kg (44 lb) to the car, not that much but still extra weight.
Looking at diagrams I belive it wouldnt be to hard to get a wrecked 240 and take the whole rear suspension and put it on a HICAS car; the whole rear end is a subframe; much like the front of most FF cars (I know, I did my own transmission work on my Saturn).
Replacing the rear subframe(if thats the real term) was my orignal plan but the wrecked car i went to look at was in such shitty shape i could let myself buy it; the front drivers side strut tower broke because it hit a huge pothole, the rest of the car looked like it had been flooded or something. Nothing on the inside or the non wrecked outside was worth anything. Even the engine was crap, 210k on the clock....so the search continues.