A company in North America modifies Haldex controller boxes to alter the bias to a sportier AWD / 4WD. They are succesful with all the VW / Audi / ... ones, but when they wanted to do Volvos they were stopped by ... guess who .. Volvo.
Also Haldex sell VW controllers with a different software. They have different agreements but Volvo apparently stopped Haldex from this little side business.
The hardware - diff, Haldex clutch, axles - would take the extra power.
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