0BYICETER what is your rear diff 3 letter code ?
No,you need:To understand correctly.
Do we need a gen.2 Haldex unit for parts to make it work with the Gen.4 Haldex?
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-Golf IV R32 Wavetrac
-OEM Haldex unit for your car (you need the ring gear)
There are two ways to do this:
-As I did: get a used Haldex for your car, modify it and then replace the complete unit.
-Or you directly modify the differential installed on your car.
I would recommend the first method, because if something goes wrong, you still have a car in original state and you also can use it during the whole process.