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ok the big cylinder catylitic converter type deal on the b6 manifold before the actual cat had everything taken out of it so its pretty much jsut an empty chamber. would that not mess up my o2 sensors because they would bot hbe reading the eact same now? and my question is if i move the second o2 sensor behind my cat will it fix the problem of having a rough idle?

dont tell me to "search" cause i did.

O2 sensors will not effect your idle. Your gas milage may suffer and you'll fail and clean air test. You can't move the senors like that, they send voltage readings to the ECU and those values are from a predetermined position within your exhaust system

ok so i dont move the sensors....than what should i do?

What is your idle at when cold and warm?

I don't see how having any of that gutted can cause a problem unless it's because you need to compensate somehow.