Thanks guys, sr rolla the car will be used primarily for grip work, what do you mean if it is too wide it will want to understeer, as in its width in relation to a narrow front end, the front is gettin a fair wack of extra track.
I understand that if it isn't done correctly it will be worse that a standard car, I've learnt just how bad things can go on a drag car when the geometry changes under compression, I could only imagine what would happen mid corner and for somethin to go out out of wack.
At the moment it is just an idea, as the equal 4 link, and watts link are the way i was intending to go, though since i have access to a complete rear subframe, and since the rear floor is gettin chopped up, i think it would be good to weigh up the options available involving rear irs.
thanks guys great help
Cheers
Rhys