Don't waste your money on an LSD. For a beefed up trans get these:
Hardened input shaft
Change the gearing (3.29's), which will give you a fresh, strong chain.
Hardened 4th clutch shaft
After market clutches and bands
Stall converter, ZZP sells the 245mm ones
Also, saw this on clubGP the other day.
ORIGINAL: Zooomer
Weaker than stock, same one wheel burnouts as stock.
http://www.zzperformance.com/miscftp/IG3diff.wmv FWIW, the fastest 60' belongs to a car running a stock dif. It has the record by a tenth. The fastest 60' w/o wheelie bars belongs to a stock dif. The fastest GT 60' is in a car running a stock dif. The fastest 3800's NA, boosted and M90 all run stock difs.
ZZP runs a stock diff in all their cars. They check the roll pin every so ofter to make sure its fine. The main thing is to have a left wheel spotter so if you're doing a burnout, you can know to abort the burnout if your wheel hooks to save your diff.