While waiting for my Medusa 80mm to be finished, I put torsen in center...
Torsen it self is by Hong Nor, gear is from HPI Hellfire and is modded to fit that torsen. With that torsen, i had to get rid of mechanical brakes, as that torsen didnt had outputs that would fit brakedisc's, anyway those were just for "just in case".
Here its fitted to chassis, that gear is 52t and it fits chassis if you raise centerdiff about 1,5mm.