There is no code required for 2003 and later cars.
But, if you want to be safe, and for others with older MY cars, the Porsche (Becker) radio codes are linked to the last 4 digits of the unit's serial #.
To get the serial number for Becker CR-220/CDR-220 - Turn the radio on and hold down the 'TP' button for at least 10 seconds. The display will read - "Becker 1".
Now, slowly turn the right knob and it will display the Becker model # .
Rotate it one more time, and the serial # will be displayed on the radio (If the radio is out of the car, then the serial # is printed on the attached label).
I have the decoder program for these radios, and will provide the codes gratis (see disclaimer below).
If you PM me with the last 4 digits of the serial #, I can PM you the code. It is 100% accurate, but only 95% accurate on the 1st attempt (there's a way to tweak it if the 1st code fails).
DISCLAIMER: To be certain that I'm not
'aiding and abetting' anyone untoward, I will ONLY provide this via PM to registered members with a minimum of 25 posts -
NO EXCEPTIONS!! - SO DON'T EVEN ASK 
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