[roverT]

Welding reinforcement plates to the rear axel carrier panel for the subframe to bolt onto is starting to show even that fix too has weaknesses. Welded plated E46s are starting to show signs of cracking on the outside of the plate because the plate only moves the next weakest point outside of the plate.

I am getting Vincebar (manufactured and precision laser cut in Sweden) installed next week which actually puts steel bar in between both rear bolt-on locations to the RACP which distributes the the energy throughout the length of the bar against the inside of the RACP. It's held on by custom extended subframe bolts. The front subframe mounts are also tackled from the topside of the RACP via extended bolts and custom enlarged carriers under the rear seating area for the energy to be distributed over a larger area when the twist of the drive shaft pulls the left side down.

Just go over to M3Forums and you'll see plenty documented on Vincebar and a couple other oncoming fixes that deem subframe plates less than ideal as a fix, long term.