i keep hearing about  LSD what is it ? i know you have to take some to figure out the wiring  but i don't think subaru would advertise that.

Limited Slip Differential

That's funny. Limited slips are preferred for the rally/offroad applications and are worth pretty good $$$ since datsun guys put them in their cars. They are getting harder to find so if you come across one in a junkyard or something, try and save it and you'll have an easy sale/profit here or ebay.

I agree with whats said above. much more sought after than an open diff, either in the front for fwd, and rear for rwd, where when a wheel loses traction that wheel receives all of the power, whereas in a LSD the wheel that isn't slipping receives power by means of weights, clutch packs or hypoid gears to avoid "one tire fire" which therefore gives you better traction, or better launches.. etc..

that's what i thought.