I know this has been talked about before but I'm new to the idea of putting an LSD in a FWD car. Which do y'all recommend? The car is going to be used for stage rally and so I like the idea of the warranty on the Quafie but I've been thinking about going with Torsen for price reasons. Are they okay to buy used and if not where would you buy them? Everywhere I've seen seems to be out of stock.