Just installed this same unit in my Nav with DSP e53. It was completely 100% plug and play. Everything works, steering wheel volume, song skip, R/T button, and talking head button. Button illumination with headlights and reverse camera all work. Didn't have to rewire or modify ANYTHING. Awesome!

Regarding the back up camera, didn't have enough length on the power wire to attach it to the hatch so I'm going to have to purchase a longer power wire.

Only issue is the sound coming through the speakers won't get as loud as the DSP system did and it will distort when I reach volume level 26-27 out of 30. I turned off the DSP setting prior to removal and also tried to get the volume level as close to 50%, by ear, as possible.

I ran 2 RCA cables with the Farka harness in case I plan on just going with a 4 channel amp in the future, which is looking likely since this distortion issue is bothersome.
I do have Focals and Memphis Audio drivers in the front, they are 4ohm impedance, so maybe that has something to do with the distortion I'm having. Not sure though.

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2003 e53 4.6is DINAN Supercharged
2004 e46 330Ci
2005 e53 3.0i