For the OP its an 8L model, they are seriously getting on a bit now. That generation haldex in both the TT and S3 isn't brilliant and most of the time they don't work due to broken earth straps etc.
The S3 comes in two variants the AMK engine which is 210HP and BAM which is the 225HP engine also in the TT. They both remap to the same but going much past a simple remap and the rod's can bend easily.
In standard form the S3 is slow, brisk but not fast. Too much weight and old tired engines. A remap does make them better providing the turbo is in good condition.
They suffer from rusty roof rails and at the bottom of the doors, most have been covered under warranty though. The xenon headlight's are also a pain as the levelling motor fails and the light just points down to the ground.
A fun car? No, a good all rounder and the clean ones I think still look good.