The radio and DSP relationship in the car are self-configuring. Before the radio turns on, it scans the I-Bus for the type of amp, if any, that is connected. It will self-configure its behavior, based on the amp that it sees. This does not require any dealer coding.

Coding does two major things to the DSP amp. First, it sets the amp to expect control inputs from either a nav computer or from the MID in the dash. Second, it sets some internal crossover frequencies and equalization settings that are unique to each body style and acoustic characteristics.

Since you have navigation, if you install a DSP amp from a car that did not have navigation, your amp would shut off after about 30 seconds. That is normal until get get it coded. If you are not seeing this, then your amp is properly coded for your nav system.

The second aspect of the coding is subjective. If the amp was coded in an E38 7 Series or E39 5 Series, it may sound different in your car compared to how it might sound if coded for an X5. However, if you like it as it is, I would not mess with it.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input