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Originally Posted by PeteA
So what benefits does changing the whole M3 rear subframe bring over simply swapping out:
M3 Subframe bushings
M3 Control arms (lower) front
M3 Control arms (top and bottom) rear
M3 E92 front/rear sway bars
From my limited research its...the rear toe-arm links, the finned diff cover & the LSD?
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Other than what you have listed already you also get what I believe is a stronger and lighter M3 rear subframe with the M3 diff bushings as well stronger M3 output/drive shafts.
You can't use the M3 toe arms as they're not the correct size. You need to either reuse the 135i toe arms or get aftermarket adjustable ones if lowered significantly.
Also, when it comes to installation, it probably costs the same amount or maybe less to just swap in an entire subframe with the bushings pre-installed rather than removing and pressing in new subframe bushings into your stock subframe.
The main purpose though for getting the full axle though is cost and the LSD. It costs $4k to buy and install an aftermarket LSD into a welded diff. It probably going to cost approx $4-5k to buy the whole M3 rear axle and get it all installed.