I've only just joined this forum after owning the S3 black edition for 6 weeks. Here's what I've done so far and what I'm going to do, with the parts I have :
Done...
New mats (of course), wheel nut covers, brake caliper decals (oem had faded), subtle Quattro decals on low side quarters, re-lacquered the front Audi rings and S3 grille badges, put some aluminium covers on the P and A buttons on centre console, fitted a Pipercross foam filter in std airbox, fitted a Carplay/android unit...
To do...
OEM Cupholder lighting, oem footwell lighting, replace dome lights with oem led units