I have a strut brace on my 2.8, it looks great (which in itself = more power and speed), that's about it though.
Torque steer via RTABs especially as they age is part of the feisty handling of the more powerful Zeds..I had a bolt come loose on the Misses car and had to change a trailing arm until I could get new bushes. Fitted stock bushes as a quick measure. I had an absolute nightmare getting them in for some reason without tearing or binding up. Didnt matter what I lubed them up with they would catch when pressing them in. I got the car through an MOT but what did shock me was how much movement there was in the stock bushings. Under power the car would steer from the rear just because the movement in the one trailing arm.
As soon as I got replacement polybushes I swapped them back in. They are much simpler to fit thats for sure and the car drives great again.