If you don’t want to spend a lot of money for AMI system, you can use Analog TV Tuner to stream Audio
This is the best way and very solid.
1. AMI to Auxiliary cable – works with all 2G & 3G .
2. USB Dongle –
I got a new iPhone 6 and it has lightning 8 pins connector which doesn’t fit the AMI 30 pin connector that comes with my Audi Q7 and A8. I tried the new bluetooth adaptor for 30 pins dock and it works perfectly with both iPhone 6 and Android phones. Now I don’t have to connect old iPod and iPhone to the AMI any more, the music will be streaming wirelessly on the fly. All we need is to buy this one