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Hey JMARS! I'm in the middle of doing this swap.
Easiest route is M3 dct diff, M3 driveshafts, and then a hybrid propshaft. There's a couple of ways to do the prop:
Slightly shortened full M3 prop with a 335i gearbox flange.
Or
335i prop with shorter diff end, made from a M3 prop or as mentioned earlier on, one of a select few e38s or e39s.
If you want to swap in a whole M3 subframe, then it's a little bit trickier if you are keeping the 335i brakes. Custom toe arms are needed for the 335i hubs.
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