Our cars should have been equipted with a LSD from the factory. Not all LSD's are the same. That one there is the better, but will need to be serviced just like your clutch on your transmission after a certain amount of miles or abuse. There is a difference for the same clutch type differentials from different companies. There also is a difference for between the two or three companies I know of that do make a LSD that's not clutch type for our cars.
It all falls to a matter of money and driving ability. Get a Quaife or helical LSD if you don't plan on driving the AutoX circuit or track.
I can't comment on drag launches either or the added possibbilty of a turbo, maybe someone else. I don't have the patience. Sorry and good luck.