Same audio output to Android auto and bluetooth

[bluky]

Good day!

 

I was wondering if it is possible to get the same audio signal to Android auto and Bluetooth (or the headphones jack) at the same time.

I used to have a custom audio solution in my previous car but cant build that into my new car (its a lease car). My idea was to connect a amp (with its own battery) to my phone for the bass and use the stock audio from my car via Android auto at the same time, i'm not sure if this is possible (cant find something usefull on the internet).

 

I use the Sony Xperia 1 mk3 and the car is a Peugeot E 208