1 way only locks up on acceleration. - I think the stock lsd is one of these

1.5 way lock on accel and a little on decel - Probably best choice for the street and track.

2 way locks both ways - can cause the rear end to slide out at times :o - good for drifting. I bought one of these, but havn't recieved it yet.

do you have a rwd corolla? Theres a group of us that hang out and go drifting and stuff. PM me if you want to come hang out or whatever. my aim is toyotageoffrie

-Jeff