I am confused also. If you don't know much about it then just get any LSD to start with if you must have one. Learn about it after that once you have felt how it works. The adjustment is most likely to do with ramp angles. Ususaly only race teams bother changing this. You maybe able to modify some LSDs with a grinder. Otherwise you will have to buy parts.
What is it you want?
For hot laps I am happy with a locked diff. For on the street I am happy with a open diff. With a open diff on the track, my laps will not be so hot and I am more likely to spin out. But note some race cars have a open diff, due to the rules. For drift I want either a locked diff or a LSD that works. For the street it does not matter one bit.
If you want different ramp angles, thats getting a bit advanced. And almost a waste of time talking about it untill you have tried one LSD to start with.
