HP to HK Sound: Door Wires

[Lukas]

It depends on what you want to achieve and how much work / money you want to invest on this. 
You will need to do a lot of rewiring and buy the speakers. 
The HK AUD (High Performance Plus)  part number you need is 31456942.  You need to make sure that the donor car is XC40 otherwise you will need to reflash it to change the speaker output configuration matching the XC40 speakers which is quite different than XC60, XC90 s/V60 and s/v90. 

Have a look at this  and this

I have already bought speakers, but not HK.  only high performance.  so I have to do it to make it work.