I've got a Wavetrac coming in from HP Autowerkes since I've got serious traction probs even with the PSSs and M3-spec LCAs from ECS Tuning. Should be here Tuesday and since CFB season is over for a while, I'll be doing an install thread here!
I'll try to get as many pictures up as possible and detail how I did it. I'll be doing the entire installation by myself (except the alignment) in my garage using basic hand-tools and some specific tools (like the driveshaft wrench) when needed.
Merry xmas to me!
EDIT: pics of parts attached
Wavetrac diff was boxed quite nicely
'09 E93 M3 6MT, H&R sports, 15/12.5 TMS spacers, VF540 kit on the way
'09 Z4 sDrive35i, Deep Sea Blue Metallic, DCT, Premium Pkg, Ivory Leather pkg