Sorry
@ved789 - the tread was on RS3OC.com
There is quite a long post with pictures. The branching tube i've mentioned earlier seems to be the only noticeable difference. Just before the two pipes feed into the rear oval exit, there is a branching tube on the Sports exhaust which isnt present on the standard one. There may be more differences and/or software changes too.
From memory of the other post, the sports exhaust is ~£1600 to retrofit!