While the limited slip functionality of the Torsen differential is purely mechanical, it can be enhanced with the use of electronic traction control that utilizes brake actuation.

worn torsen differential

worn torsen differential

A new 2012 Mustang Boss 302 retails for about $41000, but $43000 with a Torsen and Recaro seats and $47000 with the full blown Laguna Seca package.

Always good idea the change the transmission fluids every 2-5 years or so. The torsen-quattro doesn't require maintenance unless it's dripping oil out.