Which forum deals with the Audi 4000? Is the 4000 an A3, A4, A5, S3, S4, S5 or something else?
That corner of this website has slowed down considerably.
For the most/best info, you will also want to try Audi Fans.
If you have a 5 cylinder, you don't need a stereo.
What is a Homologation car you ask?