On the S3 if you look inside the right pipe it has a flap which opens when about 3000 rpm or so.
If yours is a 2.0 tfsi non S3 then it must be that the centre silencer isn't needed to keep noise levels down to the required amount.
In terms of a sports system yes you'd say you had a non resonated already.
If you added a decent rear silencer you may get the sound you want for much less, although it would be to cut and join.