I have been building a sound system in my 2 as the stock speakers are poor to say the least. I will upload some pictures when it's completed buy this is what I have done so far
Stock Sony double din
Samsung Bluetooth adaptor plugged into the RCA input (unilink adapter to trick the HU)
Add a remote stalk for easier access to controls
Mb quart 16.5 component speakers in the doors
Memphis crossover
Hertz ep4 digital amp in the passenger side bin
Hertz 8" with 10" reflector slimline subwoofer in the bins.
Left to do as I like a bit of base.
Hertz mono block amp
UD sub boxed ordered from markiii
6.5 Jl subwoofer
So far sounding all nice, just hoping the JL gives me a more deeper bass. s:D :D s:D