The dealer states that it cannot be done unless you install a new radio for $900.00 plus dollars, isn't there an AUX port on this radio, please help... Also they say that it cannot be done thru a plug and play unit, such as the sportster and or starmate that have a built in fm modulator/transmitter... WHAT DO I DO!!!!!! 
The COMAND unit is required for the factory installed SIRIUS option, but there are aftermarket people who can help. I'm not as up to date on a 2003, but the dealer install for the 2005 E Class is ridiculous as well. Here is a 15 page 'How To' for a 2005 that has COMAND:
http://www.alldata.com/tsb/Mercedes-Benz/1130832000000_1133251200000_P-82-60-402/40201.html
Good luck, and find a good aftermarket guy.
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