stereo

Hi, Just before I go ahead and buy a rather nice 2015 A5 Sline Quattro, - which is fitted with the standard Audi system. If I buy a used Bang and Olufson system including speakers and amp, are cables in place at all locations including the dashboard to fit the Bang and Olufson system? Any help...

Trying to find a wiring diagram for the stock (not B&O) stereo, specifically the wiring harness attached to the amp on the drivers side trunk side compartment. Anyone have a copy or suggestion of how to get one? Also interesting in anyone's experience upgrading the amplifiers / speakers in an...