I looked into the Torsen's awhile ago. IMO they are the best
differential going if road course racing or street driving is your
thing. That being said I have also been told they aren't the best
choice for high hp engines or drag racing. I ended up rebuilding the
T-Loc with extra clutch discs. I have a "how to" article I can email
showing how to rebuild the stock differential with the extra clutches.