Hello, for the 47th KW our new XC70 D3 AWD is announced and I am concerned with the question of how the Haldex coupling used by Volvo works? At Wikipedia it can be read that Haldex couplings are also installed in the Bugatti Veyron. Is this exactly the identical couplings or is it more of the construction principle? (I think the latter is more likely…;-)) Basically, I wonder if the entire drive train always, i.e. permanently, is running along? Only, how can it do so when the coupling only provides for the end of power when the all-wheel drive is needed? Would I be very pleased about an understandable explanation. daujoons