PAC C2R-AUDI Wiring Interface
2007 Audi A4
Crutchfield Customer Review (What's this?)
Works great, just had to call support to figure out a few line since them was bundled together labeled navigation, did use most of them line even with out any current or in coming nav. Got controls for steering too was just a quick add in to this setup.
Pros: Coustomer survice/tech support was amazing
Cons: Slightly confusing instructions