There are also the Cusco Tarmac Center diffs which is very similar to running a DCCD box with no power going into it.
And Cusco and ATS also make 2 way plated mechanical center diffs. Similar in operation to a 2 way rear LSD. It locks up hard under power and throttle off. And opens up when coasting.
I haven't driven on either of these though.
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RS Liberty - Because WRX's are only good for parts...
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