Audio upgrade confusion

[Homerlovesbeer]

Hi all,

I have a professional Nav with DSP and GPS screen in my 2004 X5.

I want to upgrade it.

I know I can buy the Avin units however being in Australia these are pretty bloody expensive and honestly I think the Android units are much better value as well as the newer units having a higher quality screen.

So my question is;

Having a DSP module, do the Android units integrate properly with the cars amps and DSP module?

Or will I need a seperate amp (which seems like an absolute ball ache).

All I want is Android auto and the same as the factory sound which I think will do me for now as I have the 10 speaker setup.

Do the Android units use the existing microphone and GPS antenna connections? Radio connections? I know you can buy a seperate module to access the car's data such as the cars CANBUS data etcm

Thanks,

I know this may be a duplicate of other posts but I'm after clarity.