You can opt for components. They are basically a pair of speakers with matching tweeters and a pair of crossovers. The crossovers just give the mids i.e beats and vocals to the speakers and the highs i.e. the chan chan to the tweeters.
JBL compos start @ 4500 and the brands and range is virtually endless!
It is possible to change the door speakers, in fact its simpler than adding a rear tray!
Have you confirmed with Hyundai if you can add an amp and sub? In most cases a warranty issue comes up.
In any case you can go in for a Blaupunkt GT4MKII 4 channel ampr for about 5500 with bill and Pioneer 308 dvc sub 1400w for about 3000 without bill + box for 600-1500 (quality dependent).
No clue on the company fitted HU.
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