When working out the 332ti project car I realized I need to save all the weight I possibly could, especially the rear of the car due to parking it in the back of a toyhauler trailer, past the axle lines.....
Using a 168mm diff behind a 300HP S52 seemed a bit of a weak link but I found out from a very good diff builder about the Euro 3.25 LSD for the 168mm case that is far more robust than the regular 168 diff.
I had one built to handle daily and track use using 4 new new Porsche organic disks, new plates, seals, etc....it is a pretty rare diff but it alone saves 20lbs or so over a 188mm diff and is very strong.
I might not use it for a drift or drag car or do a bunch of hard core launches in it but I hardly do those things anyway, to hard on gear and overall not that much fun, except maybe drifting but way to hard on cars when you bump into stuff
I am sure it could handle some hard launches, etc, I might not do it on slicks or super stick fat tires or at least more than a few times but then again, it might handle it all just fine.
It know it would hold up fine on extended track runs, in fact I planned to add at least a temporary temp gauge to keep an eye on it until I was sure not overheating, it so I would out a finned cover on it or add a cooler which is still much less weight than a 188mm diff.
By picking the proper gearing I needed, street and track, keeping the 5 speed ZF I planned to use instead of a 6 speed, stock size axles, etc......I figured I save somewhere from 60-80lbs which is quite significant.
So, there is a simple bolt in solution for those with more power that want to save weight, there is one for sale on this forum