Bit of noobie help required here- We have a newish A3 1.9TDi that has the world's worst stereo - the Chorus Double-Din Unit I want to upgrade it to a Pioneer AVH-2400BT unit which is a double din head unit I know I will need this Connect2 kit for changing the non-din area into a Double Din happy slot, but have a couple of other questions that I would really appreciate answers to. Will I need an adapter harness to convert from the connector in the existing unit to fit the above stereo? Will the rear speakers magically 'kick-in' with a new stereo (or are there actually none there - the existing unit shockingly has no fader!) CAN-Bus - will this unit be able to transmit things like the radio station (as the existing chorus unit does) into the driver console? Any other gotchas I should know about? Thanks in advance for any help!