There is starting to be some bad information in this thread.

1 - You can not purchase the AMG Limited Slip from an MB dealership. They do not import the parts for the C32/SLK32.

2 - Kleeman has installed the Limited slip on at least one SLK32 in the US. Not sure if they have done more. You can contact Kleeman directly and discuss with them.

3 - The SLK32/SRT-6 does not share the same differential with the C32. If I remember correctly the C32 shares the diff with the W210 E55 (1st Gen, non-sc'd). The SLK32/SRT-6 shares the diff with the older C43.

The Kleeman diff has 60% locking the AMG has 40% locking.

I do not know anyone that has installed the Quafie into the SLK32 or the SRT-6.

Whether it was asked or not to utilize the LSD you do not need to reprogram the ECU.