Having replaced literally everything there is to replace on the front suspension & steering, I'm finally happy with the way the car drives! But... striving for perfection, I'm going to tackle the Rear Trailing Arm Bushes (RTAB's) soon as they're still 2000-vintage. I've been doing some research...
I can powerflex them, but seemingly these will then only allow rotation of the Trailing Arm about the bush, and cannot pivot vertically to allow for suspension movement, which may cause premature wear of other suspension components. This site is worth a read!
I could put a like for like bush in there, and it would probably last another 128,000 miles like the original ones have!
Or I could follow the Vorschlag recommendadtion of putting OEM M3/Z4M ones in there which are more durable/stiff than the standard ones, but more flexible than the Powerflex ones in allowing some pivoting to accomodate the rest of the suspension movement.
Installation-wise, they're much of a muchness, as the new BMW bushes are split to allow compression for installation (see this month's Car Mechanics for one they did on an E36 Compact).
Any comments welcome