sick thread...want to do this as well. Great info. Looks like I'll need to find a salvaged M3 for the rear, shaft, and few other things, but it sounds much worth the effort. Just not a big fan of the quiafe way of doing it. Nothing against them in particular, but if a factory LSD from another car can work, I would rather that.
09 335 Coupe
94 SC 2JZ