PAC Car Cable Adapter
1999 Audi A4
Crutchfield Customer Review (What's this?)
Used in my '99 Audi A4/B5 Quattro. 10 minute install.....in the trunk. Disconnect the CD, install the iSimple and PAC Adapter. Run the cable to the front. Easy.
Pros: Shipped, installs and performs as advertised
Cons: Install guide does not discuss Pin 6/volume control....thankfully reviews do.