the mids wiring are different the pins are different go ahead and buy the dsp mid but i am telling you the pins are different. It is not plug an play.
here is another thread telling you the wires have be swapped.

http://www.xoutpost.com/467030-post5.html

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up