Thanks dkl for the insight!

The area bavsound made mention to is one of the places Im looking at, but few of the amps I am considering fit there.

I also need a place for one more 4-channel for the front stage.

Need to poke around some more back there and see if I can find a place to stuff it in.

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04 X5 3.0i auto
03 X5 4.6is