Someone bought my DSP kit off me when I upgraded to the M-audio and I have seen retrofit looms on ebay. So yes it is possible but probably quite tricky.
Stronger Amp...you'll probably stop reading at that point but incase you are still here Massive subwoofers for the boot, better front door speakers (Kevlar cones) and a very large price tag.
I imagine the loom is the same or almost identicle (two extra tweeters in the front doors)
is it the phone sound you are trying to improve, or overall audio? There is an inline amp solution offered by bimmernav I think for boosting phone audio.
For an amp, I would go aftermarket given the choice, and a clean slate.
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