Upgrade to 10 speaker system

[Simonsen]

Hi all
I have 2.5 liter e85 from 2005 with 10 speaker system and amp in boot. I have only 3 presetings on radio ( hall, church and something else so I am guessing I have hi fi system and not carver anyway I am quite happy with the sound from this old unit nice low frequencies..
Fast forward to today I just bought 2003 e85 3.0 automatic for a bit more umpf and I am happy with power upgrade unfortunately it has basic sound system with sat nav.
Can I swap them around? I don't want to play with aftermarket system as I could use system from my old car.
Any help appriciated.
Thanks

[kis]

Sounds unusual to me. You're sure there isn't a speaker set up? I thought it came upgraded with the nav.

i.e. you've check the cubby holes behind the seats and that there isn't an amp sitting beside the battery? Assuming there isn't anything, the speakers can be swapped over, as the early Z4 models were pre-wired for everything. Just check for the wires before you rip everything out of the other car!

[Simonsen]

I was kind of surprised as well unless somebody retrofitted sat nav to a basic stereo? But who in a right mind would carry out such a change?!
The set up I have consist of sat nav with, nav unit in centre console with cd changer yet no speakers behind the seats.
That would be so nice if wiring is there. Any suggestions what should I look for?

[Simonsen]

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[Simonsen]

So I was checking if I have wiring for amp and I can't find It there. And I thought somebody relocated roof motor and put some oem carpet there but it looks like I have something there is that a bluetooth module? Anyway i cant find wires for amp does that mean no go for 10 speaker set up?