Thinking of getting this LSD for my '13 550i 6MT:
https://www.ecstuning.com/b-wavetrac...309172wkwvtkt/
I looked up Quaife as well but it appears they don't make one for the manual, and Wavetrac on paper has some competitive advantages in zero traction scenarios (one wheel off the ground/ice).
I called a differential shop to ask if they would install this Wavetrac diff and he was reluctant since they've had customers complain due to a clunking behavior specifically with the Wavetrac (despite backlash being set to spec). He commented that it could have been due to the suspension being designed around the open diff and not meshing well with LSD. He didn't comment whether this was with this particular year/model so this isn't too deterring for me without more info.
Anyone done the conversion with Wavetrac or other brands? Thoughts?