it is possible. i believe that u will need the newer radio moudule
though. i'm not 100% sure. it really depends on the software
that's installed in ur current radio module. i, too, have an '03
4.6is w/ DSP and NAV (produced in '05/'03) and i needed a newer
radio module. do a search on "sirius" or read thru the radio section
on the homepage. there are tons of articles.

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