Says who?? All I know is that Haldex is limited by internal temperature, revelations which seems to be at it's max near a topspeed of 265 km/h (165 mph) ,although I have driven faster than that without any errors coming on, and according Haldex it can withstand 1000Nm of torque (737.5 pounds) which can easily be met with a 5000 RPM clutch dump.