Can I ask what gain does one get upgrading to Quaife LSD? Have seen GTI/Scirroco owners adding the LSD on their drives, however when looking at wikipedia (under Haldex Traction), it says, "The main components of the new Haldex system are the Power Take-Off Unit (PTU), Limited Slip Coupling (LSC) and eLSD (Electronic Limited Slip Differential).... The eLSD transfers torque to the two rear wheels. " What benefit can be gained by installing the Quaife LSD? What is the down-side? Any mates got the LSD installed on their S3s?