I just bought a '06 A4 yesterday and the car wasadvertised as having a 'factory' Bose stereo system. I have not noticed any Bose logos or labels anywhere inside the car. The system does sound amazing however. I was wondering if their is any coding or labeling in the vehicle that would tell me which stereo the came with the car. Thanks for your help.........

 

The footwell speakers should say Bose on them

 

I also think that if you turn the radio on with the car off it will say bose. if not go back and ask them about it.

 

yep that should say bose as well and I checked and all four footwell speakers should have the audi emblem and 'bose' side by side.