Afaik XDS is the system that uses the brakes to control wheel spin. The diff in the Cupra is a VAQ , and , whilst not a true mechanical LSD ( for those of us who remember old RWD cars) is an electronically controlled version which (is meant to) offer the same benefits but none of the drawbacks of a 'normal' LSD . https://www.pistonheads.com/news/ph-eurocars/vws-vaq-diff-explained/30560
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