I have a GTA now!
Join Date: Oct 2011
Regardless of whether you replace the whole bar or just the bushes, the bar must come out, and that means dropping the subframe.. so which ever you decide, its expensive.
If you don't replace the bar, only the bushes, you will still have problems with the flanges that hold the bushes in place and you may get knocking, new bushes or not.
In my opinion, even if you one decides to replace the bushes with powerflex, you should also replace the bar at the same time.... Saves in the long term, and the bar is not expensive.