https://www.z1motorsports.com/z1-pro...l-p-15815.html
For those wondering, this is probably the one he is talking about. Both it and the Quaife will operate similarly.
Neither them nor Quaife go into torque bias ratios, but I'm going to guess they are both somewhere between 2:1 to 3:1.
A good time to upgrade LSDs is when you are getting noticeable single wheel spin from a launch or spinning just your inside tire and not putting power to the outside one when powering out of a turn.