Porsche will sell you a PCM retrofit kit from their Tequipment range, but it will cost a small fortune.
Do you have Sound Package Plus (SPP) with your CDR31? If so, upgrading to PCM 3.1 using a mix of used and new parts is quite straightforward and relatively affordable. If you have base CDR31 without SPP then you would need amplification to go with the PCM and that becomes more tricky. Doable (I did it on a 991 GT3 without any impact on warranty renewal) but it's much more involved and probably not for the faint-hearted.
James
Do you have Sound Package Plus (SPP) with your CDR31? If so, upgrading to PCM 3.1 using a mix of used and new parts is quite straightforward and relatively affordable. If you have base CDR31 without SPP then you would need amplification to go with the PCM and that becomes more tricky. Doable (I did it on a 991 GT3 without any impact on warranty renewal) but it's much more involved and probably not for the faint-hearted.
James