Installing Bluetooth
https://www.kufatec.co.uk/shop/en/au...bluetooth-only
http://www.auto-brochures.com/makes/...%20A4_2011.pdf
The Bluetooth in the B8.0 did not include music streaming from the source device, only hands free functionality. If you wanted music streaming, you needed the Bluetooth dongle for the AMI port, another feature that was an option rather than standard for Premium trim.
You linked a product from Crutchfield, but if you look at the details for that product, it only supports 2007-2009 for the A4. I'm guessing it's tied to having MMI 2G.
If you have the AMI port in the glovebox, that's the route I would go. Otherwise, I'd get a Bluetooth to FM transmitter. This is what I got my niece for her car that had no bluetooth or auxiliary input. It works fine. She just has to answer calls by touching the phone, turning the radio down herself, etc. If you're dying to retrofit the OE Bluetooth solution, it seems there was one (I'm guessing you have a non-MMI vehicle). But Audi discontinued it, 8K0051793.







