Adding a CD player?
You may be able to fit it otherwise but it would have to be all custom,
Some people have tried using the single concert CD from the Audi TT.
From what I've read here though you may still have wiring issues.
This is also assuming that you do not have the BOSE system. If you do then it adds to the cost since the BOSE amps will only work with the BOSE HU.



