Some picture from my findings today.
Whiteline vs Addco bars:
B15 rear beam is a lot skinner then the P11 & Maxima ones:
Installed the mounting point on one arm.
Other arm wasn't so successful
If the bushing didn't go so low this could be still usable
Another point of contact
This bar can be usable, you need Addco rear bushings though, and a small exhaust.
Instead I installed ES bushings and Addco bar back. Tried to keep the bushings as far out and as far back as it goes on the arms.
Stock bushings do suck, they are pretty much built to deflect a ton. Look at the thin strip that actually has contact with the metal.
I wish I grabbed the picture of the ES bushings, but they have a bit bigger contact patch, but they also have shaved ends for some deflection.
Car does seem to handle a bunch more, I'll see how body roll is on that downhill S turn hopefully tomorrow.