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Originally Posted by e32lover
I would like to change the head unit output from speaker level to line level.
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Try to code it to hifi, that variant uses an external wired amp.
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Also, would be great to have line level out for the front channel, and speaker level out for the rear.
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You can't do that.
If you want better sound than the basic stereo system, I'd recommend the Alpine hifi retrofit kit from BMW. It takes about a day fitting it since you need to pull a wiring harness from the HU to the car boot, an that requires removing a lot of interior trim parts, including seats and doorboards. But the result is absolutely worth it.