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The CLA uses an older version of Haldex and is 100% fwd until it detects slip. Maximum rear transfer is limited to 50%.
The RS3 has a newer version of Haldex (exclusive to VAG) and sends a fixed rate of 10% to the rear and more as it slips to a max of 50% also.
That's very different in comparison to a normal quattro or 4Matic car that will be 60% fixed to the rear (already more than full slip in the above two) and can send 100% to the rear and typically have an available lsd to shuffle power side to side too.
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