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I bought the Performance Friction Z45/Z29 BBK to reduce the unsprung weight in the rear. I had the ST40 on 4 corners on my E46 M3 and I think the rear are too big/heavy for the task. I think a 320mm x 28mm can do the job instead of the 355mm x 32mm.
If 332mm x 32mm rear are available from Stoptech fro the E46 M3/Z4M platform, I think it could be an option to consider. I think they have the ST22 calipers available but you won't be able to switch pads front and rear.
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