There's nothing out there that will make it a true mechanical connection outside of what seems to be described up top in the OP. Syvecs makes a controller that can allow for more than 50% of the OEM torque to reach the rear wheels but, it can't change the actual nature of the setup. To that end, it also exacerbates the issues that Haldex has and as such, increased wear or breakage is typically seen. Going down this road begins to look really appealing because I think that some folks still don't know that you could make 1000whp but only have 172-brake torque reach the rear wheels due to the software/hardware limitations involved in the Haldex controller and the surrounding components. Hank, from Iroz, has covered this many times. So, with more than 50% of the OEM torque reaching the rear wheels, you could effectively get more potent launches, provided the components involved can handle it. Look at all the high powered RS3's and TT RS cars out there breaking driveshafts left and right trying to get power to go to the rear.
This is largely why I have refused to get a Haldex controller for my car. Software simply telling the system to increase clamping pressures and to do so well beyond their rated figures, tends to end in failure. I've always felt that the true solution to this is a mechanical one, starting from the transmission on back, effectively removing Haldex altogether.
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