2004 Boxster radio upgrade with bose speaker system

[RE2Master]

Well on my not so smart "smart phone" I've searched a few areas and was wanting to know if in adding an aftermarket Bluetooth radio what else will I "have" to replace or can I make the existing amp work with the new unit with some mods? Being a small cockpit and some new speakers sounding good enough without an amp if I have to sacrifice the amp I'm fine with it and will be selling all the equipment very cheap when done as not needing it anymore and would rather help someone to fix theirs that wants to stay original. Actually if anyone has a instrument cluster for a boxster s with the white faces I'd trade the whole system for it as I want to also upgrade that as well. I am located in central florida area if interested so can estimate shipping costs.

[Deserion]

https://www.bergvillfx.com/index.php/products/car-audio/wiring-harnesses/iso-audio-power-harness-porsche-996-boxster-most.html

The adapter here will allow it to be almost plug & play and retain the existing amp. I know there are likely other options but this is the only one that I'm immediately aware of.