Diff is sitting in my work area with the cover off. Great success today.
Was able to drop the diff using easily obtainable tools and without removing the exhaust.
I've got quite a few pics, I'll post them up when I'm done. I'm thinking of starting a new thread as a howto.
Here's two pics
'09 E93 M3 6MT, ESS VT2-650, UUC/Corsa, MS X-pipe, H&R sports, Volk TE37SL 18x9.5+22f and 18x11+34r, Spec TwinDisc P-trim, UCP
'09 Z4 sDrive35i DCT, JB4, DCI