Current builders for Quaife/Wavetrac front differential?

[TheDarkSideofWill]

I have a project for which I want to build an E53 front diff with Quaife or Wavetrac limited slip.

What experiences do members here have both driving with such a unit and building the diff in the first place? Has anyone driven both Quaife and Wavetrac?

What shops will assemble and setup the diff for me?

I found some related threads searching:

https://xoutpost.com/bmw-sav-forums/...ferential.html

https://xoutpost.com/bmw-sav-forums/...p-lockers.html

https://xoutpost.com/bmw-sav-forums/...ted-slips.html

https://xoutpost.com/bmw-sav-forums/...and-build.html