These boxes are pretty strong but no box will take abuse for long with this sort of torque, that said as long as you don't go slamming it throw gears ( especially at high rpm ) and don't drop the clutch for the floor boards it will hold for a while
Edit: and run the right oil, PM me about that
Really comes down to how you drive it, a bit of machanical sympathy goes a long way
I have a triple plate in mine at the moment and other then the rattle its not that bad but I always load the driveline before giving it the sauce, a good twin plate would be nicer on the box and to drive, what Paully suggested or an Exedy Hi-Torque twin would be good
The Nismo 2-way is the tits, just look into a Quaife ATB LSD for the front