Someone over in the R32 forums did it to his R32.i believe this one shop with A3-S3 did it.
i cant remember name
they had a white a3
then they found a quattro rear end with manual transmission
they swapped it in
prolly will cost you no less than 10k to do it.
oh and they did it on a 2.0t
not sure how its done on a 3.2 2008