The man in question is running a 560 BHP twin turbo V6 and is looking for a programmable transfer box so he can vary the torque split. I don't know which would be best for his needs .
The R32/R33 transfer box have a much bigger chain inside than the R34 version. Having said that, I haven't heard of an exploded R34 transfer with big HP (up to now). So, I guess you can take either. Have a good look at the For Sale section; there's at least one R32 I know of that's being parted out. You can also try Abbey Motorsport, they may have a transfer box.
I'm based in the Nijmegen area. Got no time on Sunday unfortunately - have to get the car back from the show in Hasselt.
Don't catch a cold in Amsterdam trying to get on a level with the locals there :smokin: