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If you're talking about swapping the whole final drive, I've read that it will bolt up to our sub frame. You would need the M3 back part of drive shaft, and the 2 M3 half shafts. The drive shaft would be married to the front portion your drive shaft. The M3/335d shaft combo would need to be shortened on the back end.
None if the above would address getting the taller 2.81 ratio. You can get that too but it will be costly as you would be buying a different ring and pinion. Go checkout diffsonline.com
Your likely to spend less by taking fundguy's advice
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