Just FYI, somewhere buried in this thread is my riced out S3, and my A3 was even worse... to everybody's gusto...
If you like your car, good for you, and it's all that should count
My points I don't like...
- That gen of the A6 already looked sad. Your front lights make that so much worse. (My Upgrade : OEM Bi-xenons)
- Your canards are not well put, both on esthetic and function ( too much space between, too much in front). Also as there is enough weight in the front, one does not really need more downforce
- Rear lights. (Again OEM would be much better suited, there are even OEM LEd ones if I remember correctly)
- Your license plate. Why put it there and not where it was intended, it breaks the lines of the bumper)
- Duck tail. (Again the boot from the S6/RS6 had a bootlip, which looks really nice. This is madness

)
- Exaust pipes sticking out too far
What I can live with:
- Black roof (though that white is splendid, and I wouldn't have done it)
- Winter wheels
As for racing the car, you only have one way, strip it completely to get that weight down. It's not really that intended for it. But that is your choice, there are much worse choices for a track car...