EVTV have exclusive exclusive distribution rights (USofA? North America?) to the Quaife limited slip differential for the Model S.
The Tesla's torque vectoring acts by retarding the faster side of the car. Quaife's best selling unit is for BMWs that also have torque vectoring because it makes them faster around a race track. EVTV's interest is in putting the drivetrain in cars that don't have the same wheel hubs, but they (2ea for AWD) should make a stock Model S quicker.
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