I've not done anything car wise myself for ages so can't find the location for that for you at the mo, there's full mk4 & 5 R32 def files in the def files area that should help you find everything you need on the 711's though.
The 711 (ME7.1.1.) is kind of a hybrid which was developed at the turn of the Millenium when all the emissions tests/legislations were developing themselves so only used on a small number of vehicles (VR 24V's/W8), hence why there is no Function Sheet (FS in English), Funktionsrahmen (FR) in German to get you used to the differences in lingo.
To learn the system I'd start with VAG's overview of the 711, link I've added in here;
http://nefariousmotorsports.com/forum/index.php?topic=15773.0title=Then read through the FS's of the ME7 (20vt/Alfa) as well as any later ones you can find on the net ME/D 9 for example and look at the evolutions of the ME system between them, all on here in the Tuning area edu bit.
You should then see the applications and the related maps that you may need to check, the relationship with things like SAI (which you may or may not remove also), lambda and so on and then what you need to check in that respect (start/after-start/fuelling etc) as well as function (heating/electrics/ESKONF etc).
So you can disable them if you've gone de-cat and no bungs in the exhaust or add bungs and use them as further monitoring but you have nothing in-between the 02's now (the Cat's) - so what mathematical changes/sensor reading changes will happen due to that, i.e the maps mentioned above or in the FS's.
