Thanks for the comments. I think I will be pushing the button on this within the next few weeks. I will let you know what I think when I have had a play. In my 135i with over 400BHP it helped but the torque in the diesel is soo much greater, so I hope it gets hold of that alot better than without the LSD.
Oh yes, I only have traction contol on in the wet. When it's dry it completely off all the time
335d M Sport Coupe (2010) Titanium Silver:- 19 inch Wheels, DAB, Memory Seats, Prof Sat Nav, Sunroof, BMW Performance Carbon Fibre:- Boot Spoiler, Mirrors and Front Lip Splitter, SSDD Carbon Fibre Rear Diffuser, SSDD Black Kidney Grills, 12.5mm Eibach Spacers x4, Red Calpiers, CKS Custom Exhaust, Wagner FMIC, Sprint Booster, DMS 360BHP / 700+NM Remap, Quaife LSD