Currently got a double din BOSE powered Symphony 2 headunit. Am I right in thinking the BOSE system has it's own powered speakers and subwoofer running in the car? I'm thinking of getting a double din replacement headunit (with proper ipod and bluetooth nonsense) but a) Would it look 'right' in the dashboard? (as aftermarket stereos in cars like BMWs look awful) and b) can I retain the BOSE speaker / sub setup (I.e. do I use something like this - http://www.crutchfield.com/S-Cn0382pRtP4/p_120701787/Audi-Wiring-Harness.html?tp=2977) Cheers!