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Has anyone put in a DSP unit in with the standard stereo cdr23 into a Boxster 1999 that didn't come out with a dsp unit???? Can it be done or not??? I have a new DSP unit but don't know how to wire in.... If this can't be done please tell if it can please tell how???? Or do I just throw the DSP unit thing in the bin and don't worry about trying to get installed... Anybody out there can HELP thanks heaps........................