The difference is this. For X5's produced before 2003, BMW installed a digital DSP system in the vehicle which had a 3 pin connector (power and i-bus connections) and a coax connector (audio connection). Starting around the change over from the 2002 to the 2003 production, BMW started using an analog DSP system that eliminated the coax connection and just uses the same 3 pin connector (power and i-bus) and 6-pin connector (audio connections) as the non-DSP vehicles.

Thus for your 2005, even though you have DSP, you do not need the DSP adaptor kit because you don't have the digital DSP system, you have the analog DSP system.

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