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"An add-on kit used for BMW vehicles with factory DSP (digital signal
processing) radios. Enables the DICE i-BMW-T, available separately, to be used with some DSP-equipped radios."
For use with factory DSP (digital signal processing) radio only Connects to pre-wired CD changer cable and coaxial digital cable in the trunk Works with factory "Standard" or "Business" radio, with or without navigation system. Not all DSP radios have the coaxial connection in the trunk. Some have the regulat 6 pin connection and do not require this interface.
Link to Dice Electronics Installation Instructions: http://support.diceelectronics.com/files/dsp_supplement_adsp01.pdf