A kit to install M3 LSD -- half shaft links and drive shaft piece. Not sure what the software would involve, must be difficult to program DST/DCT.
If parts pricing for complete LSD is under 2K msrp, 1700 w/ discounts at Tischer etc., then it will be very successful. Labor would be about $400, but one could swap rear sub-frame bushings, rear sway, etc. at same time and save.