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"Audi are now offering Quattro with a torque Vectoring diff (aka X6) on the S4 only at the moment but unlike the X6 system which I believe only works under load from the engine, the Audi system also work without any throttle input on entering a corner and slows the inside rear to improve cornering. I'm a bit surprised as to why they aren't rolling it out across the range, maybe it's solely a S and RS product for now and all future models baring either badge will be offered the option of TV or might it will be standard on the RS and a option on the S."
I did not realize that they were given the green light on that... it is a similar system as the X6, does not require load.... much better that the Acura version.
BMW had the exclusive rights to the tech (co-developed with ZF), but it must have only been a year or Audi developed something similar.
BMW is also going to use this technology in RWD cars supposedly.
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